Malicious PDF — malware analysis report

Static analysis result for SHA-256 62f1dfa9fa0f42cd…

MALICIOUS

PDF

80.4 KB Created: 2021-03-15 11:23:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0b135dc6748f85bccbf21cc35b28b8a2 SHA-1: 886ab0d7473f614bc4dcb623184c786d88c71191 SHA-256: 62f1dfa9fa0f42cdbdb9ed1a0a6bb18d75cd5063c9ea2dea32c0c7ceeda03cf1
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 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=how+long+do+viking+stoves+last PDF link annotation
    • https://duxudalo.weebly.com/uploads/1/3/4/8/134866109/dejeru-pukijil-xipalixadinosix-putavetavupeli.pdfIn PDF document text
    • https://dejifokafabowek.weebly.com/uploads/1/3/0/7/130739182/8986145.pdfIn PDF document text
    • https://kobirozo.weebly.com/uploads/1/3/4/8/134846370/vasopugujap-sigubexisetoluk-ponuk-xuwazuxiw.pdfIn PDF document text
    • https://gisipunav.weebly.com/uploads/1/3/1/6/131636927/e983ee8.pdfIn PDF document text
    • https://lefamadagizid.weebly.com/uploads/1/3/4/7/134704745/1fbe9724d0.pdfIn PDF document text
    • https://galixasuja.weebly.com/uploads/1/3/4/5/134518214/74861ec5.pdfIn PDF document text
    • https://zikegebuner.weebly.com/uploads/1/3/4/8/134856814/3775a63a02.pdfIn PDF document text
    • https://nowimadowa.weebly.com/uploads/1/3/4/7/134705132/kejanu-tokemuj.pdfIn PDF document text
    • https://jimedugevebuz.weebly.com/uploads/1/3/4/4/134437071/9500697.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/5798e7d4-390c-40f0-84b0-1056a7dfbb16/79965782996.pdfIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_04336230d16c4d7881a99604b6119787.pdf?index=trueIn PDF document text
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_4717ef07ae844340a62252b1d113b639.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gapivegek/25764075114.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a5da294-0946-429c-97db-dd5a31391893/78499501611.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/caslon_black_font.pdfIn PDF document text
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_4896d3c197aa4e11bd33b59dff4cda10.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/resisuna/forum._xda-_developers._com_android_hacking.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/35293939326.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/10110791847.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f0077fb-2e90-4b3a-b34d-b8681c826f75/what_are_examples_of_professional_development_goals.pdfIn PDF document text
    • https://e0271a52-a7af-48e9-8a99-924ce320ec62.filesusr.com/ugd/be5703_3db7d0cc46dd4aac90522776224cdba3.pdf?index=trueIn PDF document text
    • https://af30af13-e0b7-4de0-aca7-7783c01eade2.filesusr.com/ugd/9757e7_0c5e2bc2bf524b9d9d366854624bfbcd.pdf?index=trueIn 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_off0000fba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA6 5076 bytes
SHA-256: d57f86aa9d72b312a203de2991f512b5ff843ad77d3c3250fea00cbe03db8298
font_01_sfnt_off00010d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D19 11528 bytes
SHA-256: bcaa7f4e3dcaa699ca59ad05fcc6b2271ead7246b11c207f4fde752d12924058