Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc595421a7662b2…

MALICIOUS

PDF

71.6 KB Created: 2021-03-26 07:28:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 82c2100597cf38d773fb4d9087e39049 SHA-1: 8040da29aa8e199c356ce7cf8feff5b0dd6db1d3 SHA-256: 9dc595421a7662b2e309567e4c520986d8c0a8fe20b21ba052d10e05f92cc4d0
126 Risk Score

Malware Insights

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

The PDF file is detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with a notable one pointing to a link farm on disposable hosting, suggesting an attempt to distribute further malicious content or redirect users to phishing sites. The document body, though heavily obfuscated, appears to be a lure related to free book downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=shia+books+urdu+free+download+pdf PDF link annotation
    • http://carluxepaint.site/biostar_x370gtn_manuallncg8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455183/normal_6007aa0f380ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464995/normal_600a54d3d6712.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413362/normal_6040a6c7b35d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453732/normal_603650923ac68.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487431/normal_5fe374462d04c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414169/normal_602d0e6d8d886.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424630/normal_5fda324ea1dc3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382190/normal_5fc5f53adc3d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502698/normal_5ffed49c9b1d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459777/normal_6058bb293316c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481675/normal_6059d10d38783.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454811/normal_60089525e9c01.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484375/normal_5fce283d67b86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368989/normal_604efb22edeec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414491/normal_5ff0ec49838c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466675/normal_602f1b6b1051c.pdfIn PDF document text
    • http://vashastrahovka24.ru/how_to_change_avatar_photo_in_call_of_duty_mobileabk4p.pdfIn PDF document text
    • http://good-production9.site/zevinanipavojevipen53hc8.pdfIn PDF document text
    • http://sayseedokg.com/7806170014oql31.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wanedinak.epizy.com/jason_capital_net_worth.pdfIn PDF document text
    • http://gasigigi.rf.gd/kenshi_armor_smithing_guide.pdfIn 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_off0000dc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC46 5528 bytes
SHA-256: fc3701780fb9ee26e0a642dd03809826f52c7b4ca97baf2283d0e8a8f8d804e8
font_01_sfnt_off0000ef14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF14 9928 bytes
SHA-256: 335ce178c7d268717e3af75e1695e29812f8494a9edf11a11b0e2ad5469f3d78

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