Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3905c0f8262ceff…

MALICIOUS

PDF

80.0 KB Created: 2021-03-24 20:27:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: d447100c54354463cbabead36ad5ed0c SHA-1: fbbc0d68cec9f1898c93121d889e2b5752e21c65 SHA-256: e3905c0f8262ceff04f68b32fd532d252add5a6238ceac03a5de1696326ce189
126 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs, with one specifically pointing to a domain associated with phishing lures. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is part of a link farm on disposable hosting, suggesting a phishing or scam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload or redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://midufefew.ru/award?keyword=understanding+the+mathematics+of+personal+finance+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408462/normal_600e5729bd044.pdfIn PDF document text
    • http://suxulopiluv.22web.org/cds_syllabus_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380380/normal_6001ec8c549ca.pdfIn PDF document text
    • https://cdn.sqhk.co/jimatoju/dANklie/xatevezukebaziben.pdfIn PDF document text
    • https://cdn.sqhk.co/mazinenik/g3ia2DI/mofexuderazeki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387582/normal_602e2b5f4b11a.pdfIn PDF document text
    • http://dezejosetoduz.iblogger.org/vofunemo.pdfIn PDF document text
    • http://xokijaxano.medianewsonline.com/fresher_party_anchoring_script_in_marathi.pdfIn PDF document text
    • https://cdn.sqhk.co/kosadara/f0ihrjd/ludo_star_2_cheat_codes_for_android.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/f8e3c16d-b293-45c5-8d33-9c10e6da9cca/eventide_h9_harmonizer_presets.pdfIn PDF document text
    • http://xifimerin.onlinewebshop.net/86780601764.pdfIn PDF document text
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_b96cbec5043945af9850dac072271c04.pdf?index=trueIn PDF document text
    • https://91506351-5699-48ce-85e7-8e7d071f4e87.filesusr.com/ugd/d775a9_27cbe9a573054d0d8c6766d76f33c083.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/70750d71-437a-43f0-b367-083ae00f1a42/limexisorovovopeseduma.pdfIn PDF document text
    • http://bemisiba.epizy.com/51353314306.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab05c3c3-d77b-4a0b-9ac8-0579dcb9f083/yamaha_natural_sound_av_receiver_rx-v671_manual.pdfIn PDF document text
    • http://zotijoxamofos.epizy.com/xolewebo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/007f063d-33c1-4021-96b3-1d355433e301/lejakopako.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36cb3dd9-2265-40c9-a61f-70619614f1bf/72115132727.pdfIn PDF document text
    • https://17c3d818-7f64-4152-976a-2fa997d7a7be.filesusr.com/ugd/e2c250_004baf8da2fe4504ad3ea02cb9021cbf.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FB 5560 bytes
SHA-256: eda413bbaa1a101fc28e6d8de61a3cd981e84a332f055c8238e734ea28bb7742
font_01_sfnt_off000109c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C3 12084 bytes
SHA-256: caa8e8eadede3f74f511418958326165b480d832ac7be93854c30aa5436fddb9

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