Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7bf38363076225b…

MALICIOUS

PDF

72.9 KB Created: 2021-02-22 03:39:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 6e530090c7818ad558861ed33014c79b SHA-1: 9002a22b6c42cee07b2edb2353c404db3d7af67d SHA-256: f7bf38363076225bc6f0769ab384df7ebe0fdbb26e9c61c64f3b101fdb46f916
186 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm and detected as malicious by ClamAV and an ML classifier. It contains numerous external URLs, many hosted on disposable domains, suggesting a tactic to distribute malicious content or manipulate search engine results. The presence of embedded JavaScript, though not fully analyzed, further supports the potential for malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://leonvi.ru/123?utm_term=apple+airport+express+turn+off+5ghz PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4486963/normal_6004946c0fffb.pdfIn PDF document text
    • https://watorixaziju.weebly.com/uploads/1/3/4/5/134586039/jexobefo.pdfIn PDF document text
    • https://vipegiwofavagob.weebly.com/uploads/1/3/5/3/135302795/285744d4114.pdfIn PDF document text
    • https://butegipabozu.weebly.com/uploads/1/3/4/2/134235803/498e8a5fc65.pdfIn PDF document text
    • https://vavetoros.weebly.com/uploads/1/3/4/8/134854671/xugunebowo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452588/normal_600f81ee4592c.pdfIn PDF document text
    • https://nefipoxitusi.weebly.com/uploads/1/3/0/7/130775115/3673923.pdfIn PDF document text
    • https://solekavugixe.weebly.com/uploads/1/3/3/9/133999951/wevoburapa_vadelefor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450140/normal_5ff1c303f1e4b.pdfIn PDF document text
    • https://sowurudiz.weebly.com/uploads/1/3/1/4/131438308/c72ab7f.pdfIn PDF document text
    • https://rimuzomidaz.weebly.com/uploads/1/3/4/3/134353295/7742204.pdfIn PDF document text
    • http://artyom.guru/33899555063u4mav.pdfIn PDF document text
    • https://rinadulig.weebly.com/uploads/1/3/0/7/130739308/6958615.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473039/normal_6018cedad7bf5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370286/normal_601626f5602c1.pdfIn PDF document text
    • https://gifivetusox.weebly.com/uploads/1/3/4/7/134736849/zabuwarutenorubopif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402707/normal_6027fd41ca766.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/oxford_word_skills_vk.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/polinufo.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_off0000e05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05B 5392 bytes
SHA-256: a110f2df793ca000c5d41a87deec8abccb11e421a9072ddfdb06819baa72b409
font_01_sfnt_off0000f2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C4 10424 bytes
SHA-256: 05aaabf4597b859fc713156ba72c5cc013b17233864dae4c4ded368157757460

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