Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b9db729c63e253b…

MALICIOUS

PDF

73.6 KB Created: 2021-06-10 02:27:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ffff516a9c8f0e92bac69a77a4ac406e SHA-1: a976a8048e1672f32953fc7cbd129088e8fea323 SHA-256: 9b9db729c63e253bb5bf2f46ffdff740b8347fc174a0db8e0320219d67e86e76
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files, suggesting a link farm or SEO spamming operation. One of the primary external URIs, 'https://synerhu.ru/pbw?utm_term=9th+grade+reading+worksheets', indicates a lure related to educational materials. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or a scam. No scripts were extracted, but the PDF structure itself is used to host numerous external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://synerhu.ru/pbw?utm_term=9th+grade+reading+worksheets PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4426690/normal_5fe439df9729c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387240/normal_6006710608963.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486548/normal_603c17c02ea29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446285/normal_6050eea741611.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408330/normal_5fed425aaaac2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456372/normal_604b8df8eb0da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464301/normal_600e461036505.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492257/normal_6001478642e2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370264/normal_6039199f5aeb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463824/normal_603798da7cb54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366973/normal_6053278c82cc2.pdfIn PDF document text
    • https://xovesoxak.weebly.com/uploads/1/3/0/8/130813458/1e1213540828a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480758/normal_6026f667313d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408720/normal_5ff03d63e9a84.pdfIn PDF document text
    • https://pokifuduxorimib.weebly.com/uploads/1/3/4/5/134501468/bobudukuzukebabolex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418180/normal_6027d839d44b1.pdfIn PDF document text
    • https://radisowe.weebly.com/uploads/1/3/4/3/134366404/ragosimowibipa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500432/normal_601b085f84d54.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/099b1a2c-5253-4b8f-a8fd-7d11233843a0/cub_scout_duty_to_god_ideas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68b8faa3-257c-4914-ab7f-313d12c2288c/how_do_i_change_my_greeting_on_my_panasonic_phone.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD688 5060 bytes
SHA-256: a34422affc4ad51caae2471f14ead8c6630a424da697f8430fda2d8e4886e910
font_01_sfnt_off0000e7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C4 10408 bytes
SHA-256: bddafb162590245ec462b2704a782010b840b75e1630f98acd2af1fd921ca221
font_02_sfnt_off00010b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B47 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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