Malicious PDF — malware analysis report

Static analysis result for SHA-256 44031eb6c06b9795…

MALICIOUS

PDF

79.0 KB Created: 2021-05-20 16:40:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 826764d8476b24efd4d8c289f5a632ed SHA-1: 2282168674ee89278c878fe71cee5795bf98bae8 SHA-256: 44031eb6c06b979567a6f87121380985cfef658316be2030ca1d3b24b4d8c006
96 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a link farm, indicating a large number of external links, with one prominent URL pointing to zajinet.ru. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were extracted, the presence of numerous external links suggests an attempt to redirect the user to potentially malicious content, likely for SEO manipulation or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://zajinet.ru/strik?utm_term=the+quick+brown+fox+handwriting+test PDF link annotation
    • https://jedunaxalow.weebly.com/uploads/1/3/1/6/131606453/f9d108e273.pdfIn PDF document text
    • https://garepogive.weebly.com/uploads/1/3/4/8/134871831/zaxus_rugunudokelot_soligokopovazo.pdfIn PDF document text
    • https://baxorejo.weebly.com/uploads/1/3/5/2/135295822/dumowek.pdfIn PDF document text
    • https://pesuwoleze.weebly.com/uploads/1/3/5/2/135295903/kudadimub.pdfIn PDF document text
    • https://mufunada.weebly.com/uploads/1/3/4/6/134623537/4211378.pdfIn PDF document text
    • https://xaminipa.weebly.com/uploads/1/3/1/0/131071220/bonixefazusemubinaxi.pdfIn PDF document text
    • https://mokazeke.weebly.com/uploads/1/3/1/3/131384082/waluguvodan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/netinuwa/2014_jeep_grand_cherokee_review_consumer_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/15660911391.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e45c0bc-2848-4274-a41e-c2eab05fc6b0/kobebedibe.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/osha_combustible_dust_fact_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/collar_x_malice_trigger_mode_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59361f0e-18d9-4e60-b1a2-d35f928d704a/matlab_increase_subplot_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9eedaf2f-e340-4361-af37-ebd8bab904db/26079875452.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/sanowubikuguzuvuwidoxa.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/96210397869.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/66992149601.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EE 5572 bytes
SHA-256: 2eefbd9c321f906ed1acbc8a59a2d41c132f7e20d9c50dbc8829e4cfbce489fb
font_01_sfnt_off0000f9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E4 10916 bytes
SHA-256: 666e741ce68e3291fd888551759a6beab171879921170095d0f82797f29b1267
font_02_sfnt_off00011f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5E 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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