Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c5e8a1bf45d831…

MALICIOUS

PDF

125.7 KB Created: 2021-03-06 07:38:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 8a64ac3045bed1b238c3a892f2631597 SHA-1: 10010b8af4acfd116641c1b2b78883584b0ef55f SHA-256: b8c5e8a1bf45d831525f2832a35a348406a01c4c47fb3364a4e43365177d020d
164 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a tactic to distribute malicious content or phish users. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics further indicate malicious intent. While no scripts were directly extracted, the presence of numerous external URLs, including suspicious ones like 'seumenha.ru', points towards a likely phishing or malware distribution campaign, possibly initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/aws?utm_term=hairspray+script+book PDF link annotation
    • https://tanofome.weebly.com/uploads/1/3/5/3/135316841/5b70618fe5.pdfIn PDF document text
    • http://retamos.mygamesonline.org/the_lightning_thief_musical_soundtrack_list.pdfIn PDF document text
    • https://tujulita.weebly.com/uploads/1/3/4/6/134687611/5797991.pdfIn PDF document text
    • https://bupedokan.weebly.com/uploads/1/3/1/6/131607930/kijegusa_zuxabojibaxiw.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/bezutu/majututotu.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/le_petit_nicolas_louisette_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/87937741536.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/little_alchemy_2_metal_cheat_sheet.pdfIn PDF document text
    • https://f0198b83-f3fe-41b4-8315-bacd7eabb238.filesusr.com/ugd/2b3f46_088595d8d0b24e28baa3ae14c7ae5580.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/damerirazib/66783996524.pdfIn PDF document text
    • http://kadoxosin.atwebpages.com/jack_and_the_beanstalk_the_real_story_full_movie_123movies.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/pizunu.pdfIn PDF document text
    • https://b913155d-2712-4fd4-bcc6-651970a8c456.filesusr.com/ugd/e39924_c8a8e681fe6f41f298c69e897f84cab9.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_off0001b3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B3C1 5164 bytes
SHA-256: 7335b803e07c554bf907283fd75a1f68df3d413197387bea9da3b268a5d7639b
font_01_sfnt_off0001c561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C561 10580 bytes
SHA-256: 8db61961818e8e16c8e207ac486816f4bd1530c5d660498f3956bbb98da12108

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