Malicious PDF — malware analysis report

Static analysis result for SHA-256 6957399c4a08fbca…

MALICIOUS

PDF

79.0 KB Created: 2021-03-05 07:51:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 4bc18df878e8898d9f916112eb63ac49 SHA-1: 002f133e62ea135206a06ae8bdfe291c18ede73e SHA-256: 6957399c4a08fbca6275fcc82e9f7b82caf2f26054e532e566d59f01c3b2307a
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, likely used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/wix?keyword=privilege+power+and+difference+3rd+edition+pdf PDF link annotation
    • https://xexafuru.weebly.com/uploads/1/3/1/0/131070851/nesozuwaj.pdfIn PDF document text
    • http://nemosixumeki.mypressonline.com/xilogerigiratusagin.pdfIn PDF document text
    • https://lenexemumuvag.weebly.com/uploads/1/3/1/4/131438583/boruxalubez-julanolato-zotaribelibaz-poxulajafigabi.pdfIn PDF document text
    • https://cdn.sqhk.co/soziwariru/Dzgedif/sipuvivi.pdfIn PDF document text
    • http://jobediniberine.scienceontheweb.net/13060734003.pdfIn PDF document text
    • http://vulenawaxoki.iblogger.org/bedtime_stories_for_adults_to_fall_asleep.pdfIn PDF document text
    • https://cdn.sqhk.co/potiribuwuf/NidVpjb/kabinaroxere.pdfIn PDF document text
    • http://tomolijoponix.mypressonline.com/formato_de_recibo_por_honorarios_sunat.pdfIn PDF document text
    • https://winugemu.weebly.com/uploads/1/3/1/0/131070294/zefadafutadomanuwu.pdfIn PDF document text
    • https://redorofi.weebly.com/uploads/1/3/5/3/135383823/550081.pdfIn PDF document text
    • https://cdn.sqhk.co/jabisopomuxo/jgjVeMZ/93044648805.pdfIn PDF document text
    • https://lufodeku.weebly.com/uploads/1/3/4/5/134586195/7427241.pdfIn PDF document text
    • https://cdn.sqhk.co/pibusupi/hbahcic/adventure_quest_dragons_mod_apk.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://7e8267f5-6380-480e-ad72-df526eaefc07.filesusr.com/ugd/cbe325_0ad2675d59404ee68325ea2f762e54e5.pdf?index=trueIn PDF document text
    • http://jesebikalag.epizy.com/japidow.pdfIn PDF document text
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_29a2884d59734507a6ab4126e9c267a0.pdf?index=trueIn PDF document text
    • http://xadamun.epizy.com/sources_of_carotenoids.pdfIn PDF document text
    • https://ec8c99fd-5413-4e38-b6a0-2ccbba71fc6f.filesusr.com/ugd/de02f3_b56afcfe71584cec8d66fef7758d2039.pdf?index=trueIn PDF document text
    • http://rolugume.rf.gd/how_to_get_ny_drivers_license.pdfIn PDF document text
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_a3d5630b032248cba7cbc0e47a27b3c4.pdf?index=trueIn PDF document text
    • https://0f8fedcd-12c0-4678-86f8-e2bff7269121.filesusr.com/ugd/70e7d4_053724f2528e4069af076f6e8fc4fd4c.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA29 5248 bytes
SHA-256: ff71ad9e0bafa7fd69b7b4177595bce4eb95b7e1e33500a54c5f6d7f88498790
font_01_sfnt_off0000fc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1E 10808 bytes
SHA-256: 508add50e300c985bec319a27c1164f681b16c0c9b658ebc7f793bcb8a841a08
font_02_sfnt_off0001205d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205D 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f