Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7d3469f7e52e669…

MALICIOUS

PDF

115.1 KB Created: 2021-05-03 18:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5e4768f6d43ce16a11f5952c5d22ba89 SHA-1: e07797d41efe502553b2a43cf94ccb73391608f7 SHA-256: a7d3469f7e52e669766d4368787782c7a0a3b4a0cdac61d65ef2a3b33d8a658c
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm designed to direct users to malicious content. The primary malicious URL identified is https://jumiwimov.ru/strik?utm_term=las+claviculas+del+rey+salomon+libro+pdf, which is likely part of a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://jumiwimov.ru/strik?utm_term=las+claviculas+del+rey+salomon+libro+pdf PDF link annotation
    • https://jevezorubik.weebly.com/uploads/1/3/4/8/134864628/6170664.pdfIn PDF document text
    • https://cdn.sqhk.co/wujejelot/gcie88k/59391846024.pdfIn PDF document text
    • https://cdn.sqhk.co/ferobisuw/hhhkieF/blablavouchers._com_voucher_codes_and_deals.pdfIn PDF document text
    • https://cdn.sqhk.co/mibemofega/b3vjUge/rakuzixizadilozaj.pdfIn PDF document text
    • https://cdn.sqhk.co/vafodagusun/giebidd/download_block_strike_hack_money.pdfIn PDF document text
    • https://cdn.sqhk.co/mowukirew/fKjcHEI/14240349580.pdfIn PDF document text
    • https://cdn.sqhk.co/bovutolomevo/g2Vhdhd/basketball_shoes_womens_black.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/giZpBgi/74601298710.pdfIn PDF document text
    • https://cdn.sqhk.co/susopavazane/fMjbhbw/53336296078.pdfIn PDF document text
    • https://gidafefutor.weebly.com/uploads/1/3/4/0/134040883/zakogufurerexi.pdfIn PDF document text
    • https://kebiluxo.weebly.com/uploads/1/3/1/4/131455508/bb34f9310cba5c.pdfIn PDF document text
    • https://zikosale.weebly.com/uploads/1/3/4/0/134013107/pubivemag.pdfIn PDF document text
    • https://kimuremosov.weebly.com/uploads/1/3/4/7/134732255/nupepa.pdfIn PDF document text
    • https://cdn.sqhk.co/fivufotimad/hbjfohg/ar_verbs_in_spanish_worksheet_practice.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://645c32c3-7e99-4959-b93b-7980205539d7.filesusr.com/ugd/30a31c_ae5087c7ba02440aa950e1a9f758017f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b475dd1-670c-4148-8998-65e003d220ff/troy_bilt_tractor_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f45615f6-0a71-4737-8201-b9f1c213edb9/plantronics_wireless_headphones_instructions.pdfIn PDF document text
    • https://6680615c-3592-42a6-94f3-b98e474b5330.filesusr.com/ugd/252546_c5c8b4a3403f4d54b656c67af9ea2ac8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ea7d509-e211-4122-8b3c-3885816f4ede/why_did_dracula_choose_lucy.pdfIn PDF document text
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_9dbc176d7a264da2961d579141e0b8ac.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d094a23b-3588-4bc9-9361-7fe22f6013b0/qsc_k12_speaker_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6b8bfd3-7085-41a8-9b34-d3a97003cedc/69422388939.pdfIn PDF document text
    • https://2a403a33-5f6e-4534-96f9-742aa7325afc.filesusr.com/ugd/d2da83_c8c3a2a221d94e8dbfe6393244c40dd0.pdf?index=trueIn PDF document text
    • https://efe523a3-d756-4f55-ba91-412f3a718e00.filesusr.com/ugd/236571_7c3b9cd465b64a1698fbd50be5fea13b.pdf?index=trueIn PDF document text
    • https://c09438b0-f1cf-4ade-afa2-d322e048c450.filesusr.com/ugd/313cc6_a89fe8a7d71b4e80b648b31b82f6a04e.pdf?index=trueIn PDF document text
    • https://3ae4d138-4ba3-4962-98fb-1b98b40a6a82.filesusr.com/ugd/38062a_20e66f95dbb2444e8934f27a6831bfd6.pdf?index=trueIn PDF document text
    • https://c07b3cb0-7d4a-4e65-9c62-eb3bd0ce3b6b.filesusr.com/ugd/7560d5_80271ddc92c343b794343bb48d906e68.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_off000180ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180AB 5544 bytes
SHA-256: bda59a9df89a052d8d6f347645ee9a6f458f6b3a75a4e26745b93de29c6bc18e
font_01_sfnt_off0001937e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1937E 13312 bytes
SHA-256: c8ae42ed2db152803d4245f92a795f8e2ebc06ae51cf1479193eb75876459a6b

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