Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f168fc8d3e90b49…

MALICIOUS

PDF

75.7 KB Created: 2021-06-02 13:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 9ab2e9205ed999d461069b1b3c5196c5 SHA-1: c82d8afc9887d5af8c2dfb73dd931acb8c1bd17d SHA-256: 3f168fc8d3e90b4986a4dc0cb889375240f97a7b0cf5d3c61ebd044f079f845e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via the linked PDFs. The embedded URL 'https://baarspo.ru/123?utm_term=ironman+dagannoth+rex+guide' is a key indicator of the malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/123?utm_term=ironman+dagannoth+rex+guide PDF link annotation
    • https://pajilolupifi.weebly.com/uploads/1/3/2/3/132302794/gavukomisara_xilofofu.pdfIn PDF document text
    • https://zotadipijipas.weebly.com/uploads/1/3/4/4/134467791/wujos_noguzuzejogep_fisuduguji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405641/normal_60494b9abaa1a.pdfIn PDF document text
    • https://nitiduzumamojas.weebly.com/uploads/1/3/7/5/137506598/vasebefogivamiju.pdfIn PDF document text
    • https://gajabalavira.weebly.com/uploads/1/3/5/3/135347595/nunupiril.pdfIn PDF document text
    • https://weziriditovi.weebly.com/uploads/1/3/4/1/134108838/6358849.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382405/normal_60634b67384dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415322/normal_5fdc0ba9e7ad5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426828/normal_5fca7e7436848.pdfIn PDF document text
    • https://kuwodugedo.weebly.com/uploads/1/3/0/7/130739904/zavez.pdfIn PDF document text
    • https://daxejinuvu.weebly.com/uploads/1/3/4/6/134645798/9104519.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375071/normal_60176affd7d0b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417216/normal_5fffd7fa89743.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498404/normal_603f9b987278e.pdfIn PDF document text
    • https://zisirusezudi.weebly.com/uploads/1/3/4/8/134846547/wusawutiwopujudogej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484093/normal_60262d2bb8fe6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gabumur.pbworks.com/f/68809908357.pdfIn PDF document text
    • http://bawamotijeku.pbworks.com/w/file/fetch/144478245/construction_work_progress_report_format.pdfIn PDF document text
    • http://vimadutukad.pbworks.com/f/gepagilalex.pdfIn PDF document text
    • http://bujolajoxek.pbworks.com/w/file/fetch/144489303/62540597871.pdfIn PDF document text
    • http://pamotekegopa.pbworks.com/f/53730524358.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_off0000ebe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE2 5032 bytes
SHA-256: a66ef6995ee543c508d0d4f89755f5b9f0629782cb0f8c423126ab4e8bfa6543
font_01_sfnt_off0000fcd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD7 10740 bytes
SHA-256: bba27d9356c6a33aa08de4958428c77f021cc6175c4cdb5dee62ec29930e1a75

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