Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c77cf939a0bec3d…

MALICIOUS

PDF

81.6 KB Created: 2021-04-04 00:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5171b04b171d7f6b8d109072df7378e2 SHA-1: 70ca465e78c7306c5a3b6823542b26acad8163c6 SHA-256: 2c77cf939a0bec3d90e14f09cb8a9dbbeb8162bfb19094328d636ae9fcabaf98
154 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure and an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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) documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://resalured.ru/123?utm_term=sample+audit+report+2017+malaysia PDF link annotation
    • http://sobakin.space/95192260498nr5jx.pdfIn PDF document text
    • http://5euro.info/jinirifejlstp.pdfIn PDF document text
    • http://bnl-jobs.com/61921749682aa5ft.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459936/normal_604d2ebd772cc.pdfIn PDF document text
    • http://sosyaltakipcipanelin.com/330840324350511h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487192/normal_604ce2105f33c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368489/normal_5ff17652da92d.pdfIn PDF document text
    • http://daddytestit.xyz/47415354460x1fn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366008/normal_603362c57e301.pdfIn PDF document text
    • http://org-fruit.space/guzarefetevapvyk16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450248/normal_602218ac37af7.pdfIn PDF document text
    • http://helps-lnstagramcopyrights-about.com/devotions_for_married_couples5m8he.pdfIn PDF document text
    • https://gedozunirep.weebly.com/uploads/1/3/1/0/131070722/6544319.pdfIn PDF document text
    • https://lomekizawulom.weebly.com/uploads/1/3/4/7/134704223/xijawa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7f3dc8b3-869c-44c5-82eb-14ae88d57796.filesusr.com/ugd/dc4ca1_de6ff1f811974cd2b65a9aa1e99965f2.pdf?index=trueIn PDF document text
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_ee889a3b5ed74343bcd7ae462f37efb7.pdf?index=trueIn PDF document text
    • https://7fd672c9-0ac8-42d3-9d3c-9ebb2fbea2b4.filesusr.com/ugd/92785a_0e66f8a6d31e48c1a1c05dc090651de0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/420122a4-002a-40a5-af8e-26767eff2235/pojokesive.pdfIn PDF document text
    • https://78fa80b2-8629-447b-ad63-53e91e8d4948.filesusr.com/ugd/8f02de_85b980a6b7eb4b88918b9d48d3c09595.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/36b44075-c880-479b-af94-8f316d858aac/19224005523.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_off0000fff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF5 5716 bytes
SHA-256: b82a4b333b66ac5bb00eb75d09ee398c494fed2ecd3925e6b53d8ad4f307c295
font_01_sfnt_off00011360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11360 11168 bytes
SHA-256: 7a556ddde5c618eef49327d28b77af0c61224530e996d0605251bdc46157d5fe