Malicious PDF — malware analysis report

Static analysis result for SHA-256 f524a0a3e23707c8…

MALICIOUS

PDF

76.3 KB Created: 2021-01-23 08:39:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 4d9ba759fcc0521d7dba40321b33fe9d SHA-1: a9739b57fdf8ebe985d63f56e9a6063e86a4ec68 SHA-256: f524a0a3e23707c8c993df7044b50fa08bdc2f5f804c026f10b299dae18ca0eb
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a PDF link farm, suggesting a SEO manipulation or content distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs points to a potential download or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://seumenha.ru/123?utm_term=hill+climb+racing+2+hacked+unblocked PDF link annotation
    • https://werotibumef.weebly.com/uploads/1/3/4/9/134900185/6065435.pdfIn PDF document text
    • https://site-1178179.mozfiles.com/files/1178179/wizuxizomodozilarawu.pdfIn PDF document text
    • https://site-1084368.mozfiles.com/files/1084368/petamuzetiduvigukubamigi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372355/normal_5fe59e79cf82a.pdfIn PDF document text
    • https://rijigajigife.weebly.com/uploads/1/3/1/8/131856487/0ae146ea064.pdfIn PDF document text
    • https://site-1250150.mozfiles.com/files/1250150/answer_amended_complaint_georgia.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389108/normal_5fe2eeb68100a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427785/normal_6001306010940.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406806/normal_5ff6226476c57.pdfIn PDF document text
    • https://juzudibat.weebly.com/uploads/1/3/4/3/134328144/sixesadosajaseleto.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384650/normal_5fe39e2458f56.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483604/normal_5fcef0d04c30b.pdfIn PDF document text
    • https://site-1174993.mozfiles.com/files/1174993/chess_checkers_set_amazon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411923/normal_6004dfaed1c66.pdfIn PDF document text
    • https://site-1174515.mozfiles.com/files/1174515/jejebewigufadisil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455197/normal_5fdae0e821aee.pdfIn PDF document text
    • https://site-1177407.mozfiles.com/files/1177407/xawavok.pdfIn PDF document text
    • https://kumeboxisadinur.weebly.com/uploads/1/3/4/6/134684257/7275267.pdfIn PDF document text
    • https://site-1174026.mozfiles.com/files/1174026/dipiluboxexer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DF 5472 bytes
SHA-256: 44e6510f2e484f077382fee0eb8f66b3cedd3cb9122fa6a8bd3792986d6ab991
font_01_sfnt_off0000fc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC46 11616 bytes
SHA-256: ce0133904b7c7568b54cf46b3bb031bba4dbf25b5f921a946170b1d489c46c57

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