Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4b054e476fe7ffe…

MALICIOUS

PDF

77.0 KB Created: 2020-12-01 21:42:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4b45eb15a2e52d6671ed0e2e0d0997d8 SHA-1: 2d54a53e1f313109270b0c59ab1a5841612b085e SHA-256: a4b054e476fe7ffe6bbc82c50439c21a8597d792585ba05833710eb51feb4e33
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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. 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 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://traffset.ru/123?utm_term=catalent+gold+program PDF link annotation
    • https://gasodugolulo.weebly.com/uploads/1/3/4/3/134375537/b30b6d52c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374703/normal_5f8b79a311478.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/6db130e93e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371808/normal_5f8c8dc068901.pdfIn PDF document text
    • https://radisowe.weebly.com/uploads/1/3/4/3/134366404/nidikik-vuwumemiwa-kewinu.pdfIn PDF document text
    • https://wivupenoremew.weebly.com/uploads/1/3/0/7/130775018/c30f4.pdfIn PDF document text
    • https://xepebujusu.weebly.com/uploads/1/3/4/3/134319702/vipogujavagewak.pdfIn PDF document text
    • https://xinomufe.weebly.com/uploads/1/3/4/7/134706409/422457.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378848/normal_5faffb7520d4d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/185eca04-a5d7-45dc-9605-545ba050dd3c/ladasemimif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/406c924b-a308-4587-989c-235970329caf/accs_onlyfans_sans_payer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe39b627-bf43-4312-b0b8-f3e485566456/fishing_power_terraria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f6035b4-0aed-4133-a10d-db8cc3ead5c1/bumofodagumos.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_off0000f0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A3 5008 bytes
SHA-256: 7d4a4396d3aa26351401eacca0b9351cd2c8d4fa536b1f616de38e8ad7a6e157
font_01_sfnt_off00010191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10191 10896 bytes
SHA-256: 5bac1c8baa80f0073374a58b094d7369c8cbb4b9b6c9109a1b851d296432eaca

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