Malicious PDF — malware analysis report

Static analysis result for SHA-256 11b9341a08e94f8b…

MALICIOUS

PDF

74.7 KB Created: 2021-02-22 08:26:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3112d45f0cc1f1df9a0783620f4bef47 SHA-1: 970e184b011ea67824c7986e34a0fd109b13d6a2 SHA-256: 11b9341a08e94f8b9a939ef911c5df3c3eaf91e384bb610a3e72615874c5fd07
186 Risk Score

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://leonvi.ru/wix?keyword=animal+crossing+new+leaf+citra+multiplayer PDF link annotation
    • https://cdn.sqhk.co/laripikiwafo/ijgdhfF/ruzagekotimiba.pdfIn PDF document text
    • https://mebevoluw.weebly.com/uploads/1/3/0/7/130739105/baxinomitusaxaxi.pdfIn PDF document text
    • https://cdn.sqhk.co/moxinivo/Viiggjg/zombie_hunter_king_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/sesijisova/Z5Kq3lR/48347692744.pdfIn PDF document text
    • https://pemilixip.weebly.com/uploads/1/3/5/3/135330450/5182793.pdfIn PDF document text
    • http://raifaisentgo.online/gubetiwewewagxbw1.pdfIn PDF document text
    • https://zukolarosaku.weebly.com/uploads/1/3/4/6/134662459/bafuweno.pdfIn PDF document text
    • http://fresh-ita.fun/ginab12y3b.pdfIn PDF document text
    • https://cdn.sqhk.co/zapiseniw/djf1FE9/fun_race_3d_mod_apk.pdfIn PDF document text
    • http://goldenframecollision.com/xedapt5sl5.pdfIn PDF document text
    • https://cdn.sqhk.co/zabeluzitema/rEhbW3m/pemekevopig.pdfIn PDF document text
    • https://cdn.sqhk.co/nefakovuwot/QwjihQH/the_hangover_3_opening_song.pdfIn PDF document text
    • https://cdn.sqhk.co/wopidevepip/jqVjceA/mesebesufufevogewadob.pdfIn PDF document text
    • https://xuvifadeto.weebly.com/uploads/1/3/2/6/132682806/fusosuxikopitiwote.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/zufojadibi/mujelasetomiwadirod.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/kozilafoziwasodowis.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/68564228746.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_off0000e2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F9 5516 bytes
SHA-256: be8e1646af84e17c41abffa894ee5218c70c6551faed1c56baf3e8284108f184
font_01_sfnt_off0000f5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BB 12248 bytes
SHA-256: aae5ed7f4b8c273f6ae2600a0e23d037c6a9cde3daa46f13507f40342cf309c1

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