Malicious PDF — malware analysis report

Static analysis result for SHA-256 135c2dce84eda0b6…

MALICIOUS

PDF

282.5 KB Created: 2021-03-18 11:52:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5cee5effe4208b9a72f076e779297a93 SHA-1: bb642a1a03d12bb56ad4d8bec566a8ecac18bae1 SHA-256: 135c2dce84eda0b6a679d3ac1834805f943a8511119371f45ca210040a9a908a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. A heuristic identified an image lure linking to an SEO redirector, specifically `https://baarspo.ru/award?keyword=bharat+acharya+microprocessor+book+pdf`, which is consistent with phishing attempts disguised as free downloads. No scripts were extracted, but the PDF structure and URL suggest a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9814

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://baarspo.ru/award?keyword=bharat+acharya+microprocessor+book+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408343/normal_601b0b7ad950a.pdfIn PDF document text
    • https://gixebodaloru.weebly.com/uploads/1/3/1/3/131379223/zozibo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368219/normal_6014d6451fe33.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370284/normal_600038b36a81a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365576/normal_6001e7695d37b.pdfIn PDF document text
    • https://xuvelufuxilo.weebly.com/uploads/1/3/5/3/135387868/jomatezaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489848/normal_603442ab5e874.pdfIn PDF document text
    • https://mogoribomos.weebly.com/uploads/1/3/4/2/134266362/zufesan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468871/normal_5fee50baabf0c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377109/normal_5ff30834279e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488316/normal_601e3596ea2cb.pdfIn PDF document text
    • https://kavibugu.weebly.com/uploads/1/3/4/9/134902942/2708047.pdfIn PDF document text
    • https://wafanipo.weebly.com/uploads/1/3/2/6/132695839/73e3ba684e96.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e929a6f-8c2b-4cf0-8f3a-919c5c8c90be/jikenemazeb.pdfIn PDF document text
    • https://88211235-bf86-4d40-a6ec-a052db2f682e.filesusr.com/ugd/94e5ef_6833332f81d34ae0bf753961c800961c.pdf?index=trueIn PDF document text
    • https://6ce95562-7558-49ee-a7b0-b3003db3b0e9.filesusr.com/ugd/d13e1f_88e66247973e4f98b0b5014fe5103463.pdf?index=trueIn PDF document text
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_828ae59bc27b45c2ab5938eb914de73c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e4c2d23-426b-43fe-9b76-4f9d84e570e5/totugavevisok.pdfIn PDF document text
    • https://5c09c65f-4728-49e3-9562-8692e696fc4f.filesusr.com/ugd/32acb1_8eb7c4a99bfd42b68c0516d6bcd149e4.pdf?index=trueIn PDF document text
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_9479617b36cc45ebbfe211a8753eff1e.pdf?index=trueIn PDF document text
    • https://52f9d6e5-2fd5-4906-a030-4d12f703b62a.filesusr.com/ugd/297ecd_a14e644c00b3476eb0d71e1fdd2283b9.pdf?index=trueIn PDF document text
    • https://4228e3e8-6e56-436b-9c2a-5710a6c3a216.filesusr.com/ugd/e32dc8_e1d8ca1180b94469aac11c57c7c1ddac.pdf?index=trueIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_ed6efb59be9c4b26b08d7773a810a677.pdf?index=trueIn PDF document text
    • https://fb4bdcd3-28a3-4206-a6c3-fb267f511c23.filesusr.com/ugd/0ad562_b267150cdad6480faa83715a10bd6848.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fbd3e2e-31b8-4ac3-851f-514b3f005402/bowenamoru.pdfIn PDF document text
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_ddff6f261de7472d9d52700feba92038.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0004024b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4024B 5720 bytes
SHA-256: 71b0de972fa5c5a1a95347377baa35bd91bbdc8b6081ce1c01a6bf17a91f807a
font_01_sfnt_off0004159a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4159A 14284 bytes
SHA-256: 2030a4f7710e6e6bf23af88996a2175806941c53e21995569e0c67e0d8e21d2a
font_02_sfnt_off0004453e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4453E 16088 bytes
SHA-256: c487aa01613208473e3c0b892de3260687b9c0341624d6c76d95d7849508583e