Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8bae69919d53611…

MALICIOUS

PDF

78.9 KB Created: 2021-04-27 13:33:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 7ae1a46107a878e412ada8684c0cad15 SHA-1: 9f5d8149389816517c41b0bc2fdd88a4b9640e11 SHA-256: e8bae69919d53611f2e673893b579dd7862008ccd61227a09bc4cbe1695805c6
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a high-confidence heuristic indicating it's a link farm on disposable hosting. One prominent URL, 'https://midufefew.ru/strik?utm_term=what+jobs+can+you+get+with+a+information+systems+degree', suggests a lure related to job opportunities. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://midufefew.ru/strik?utm_term=what+jobs+can+you+get+with+a+information+systems+degree PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4457577/normal_6031111cbf1b0.pdfIn PDF document text
    • http://masajsalonunuz.com/dewalt_dw745_parts_listdqcrg.pdfIn PDF document text
    • http://sopugepibimel.mypressonline.com/total_knee_arthroplasty_rehabilitation.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500882/normal_60263fa650dcf.pdfIn PDF document text
    • http://funseeds.site/wanuxuritojajilibelakiluxlwxg.pdfIn PDF document text
    • http://esclub.info/guide_to_clearing_and_settlement3ue0f.pdfIn PDF document text
    • http://jewogipuwivi.medianewsonline.com/povuxegubo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381531/normal_5fe76fb075bbf.pdfIn PDF document text
    • http://megantv.site/51827906950tewsa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_107317f508944540a8199ee800f4bbd1.pdf?index=trueIn PDF document text
    • http://rojanesifilagu.myartsonline.com/how_to_replace_golf_buddy_voice_2_battery.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/gaxarozolo.pdfIn PDF document text
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_f597235f2a47471888544f7343f1470e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ritoma/kipipasagusogukora.pdfIn PDF document text
    • https://e3055f73-6236-423b-b810-4bc1a15f300f.filesusr.com/ugd/fa12d1_73a763111b5f400aa36e388f9a2e9ae7.pdf?index=trueIn PDF document text
    • https://c06d174a-caca-4ab2-b5a0-4525cd3135d4.filesusr.com/ugd/856cea_2434ec4a2ec94e7584ec8618ee44656e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/legobegutulo/avery_weigh_tronix_fairmont_mn.pdfIn PDF document text
    • https://1bf92926-22d0-44a1-94fb-b51843c41cd5.filesusr.com/ugd/762c1a_e2e777a5514b4d7ab5a954164ddaaf27.pdf?index=trueIn PDF document text
    • https://291e86d0-b4b7-455e-aeca-30cd05102b29.filesusr.com/ugd/384a46_844e079a2ea84c00b304ac85189eac6c.pdf?index=trueIn PDF document text
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_94d2dc65baa1467398113f363b16ba88.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_off0000f3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B4 5824 bytes
SHA-256: 730cd72d1a202cbdbf61913d9ab886e086dc351805a0bad32ca9c93ea60b122f
font_01_sfnt_off00010784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10784 11116 bytes
SHA-256: c5726cd349ae57000f6b9ddbe4c3f43c89fd5fe21fb1b7dccad0f843e1d22eaa

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