Malicious PDF — malware analysis report

Static analysis result for SHA-256 3171b595fdfb0915…

MALICIOUS

PDF

75.1 KB Created: 2021-03-17 20:17:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 0d3228774159ff37c7626459b95c9770 SHA-1: cee8a5ce170e0b8e65f312865790e7ededa9f023 SHA-256: 3171b595fdfb091578f03f1a20ed20de5206defa6f9319a425ed342491dc5b2a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • 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://fokemale.ru/123?utm_term=citations+in+apa+format PDF link annotation
    • https://cdn.sqhk.co/sativomofij/YEUgj1Z/fobima.pdfIn PDF document text
    • https://cdn.sqhk.co/worekoxe/hjbmYF3/15462750953.pdfIn PDF document text
    • https://cdn.sqhk.co/tipekafomube/nhdjjK8/tv_guide_for_freeform_channel.pdfIn PDF document text
    • http://gavefunene.22web.org/articulos_cientificos.pdfIn PDF document text
    • https://zafudibibini.weebly.com/uploads/1/3/4/1/134108698/853ce253efc396.pdfIn PDF document text
    • http://zoxatejisiv.22web.org/84108554996.pdfIn PDF document text
    • http://xoziduso.mypressonline.com/defudevibameweve.pdfIn PDF document text
    • https://cdn.sqhk.co/letopoto/ehthggj/rufexumunurivo.pdfIn PDF document text
    • https://kiloxuloje.weebly.com/uploads/1/3/5/3/135398856/9859237.pdfIn PDF document text
    • https://cdn.sqhk.co/lojosewude/AiiRvy1/36810717671.pdfIn PDF document text
    • http://fodekofuxuvum.sportsontheweb.net/tugimuzevikuxerokal.pdfIn PDF document text
    • https://nojiwikimina.weebly.com/uploads/1/3/5/3/135315372/wiloto_sagemutive_tosedapolujuve.pdfIn PDF document text
    • https://cdn.sqhk.co/gimiraxu/aK4gwrq/carrie_underwood_new_album_2020.pdfIn PDF document text
    • http://tepifugamokeg.medianewsonline.com/9mm_sig_sauer_p938_vs_p238.pdfIn PDF document text
    • https://cdn.sqhk.co/rufadexu/gqmKgip/26679547753.pdfIn PDF document text
    • https://cdn.sqhk.co/figegixo/S8gfghI/xapezizakuw.pdfIn PDF document text
    • http://boraguw.medianewsonline.com/critical_analysis_of_big_data_challenges_and_analytical_methods.pdfIn PDF document text
    • https://cdn.sqhk.co/lewiwifo/ghicfhc/cash_dozer_reviews.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9290d578-b238-4d0e-b2ac-ff371b381068/lusuxenadotebapuwunukaxor.pdfIn PDF document text
    • http://xaviwawav.epizy.com/dodilufuvazek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/377766a5-5745-414d-8519-e074a8a23c2c/is_my_samsung_tv_120hz.pdfIn PDF document text
    • http://ruguwusizomu.epizy.com/world_of_darkness_werewolf_gifts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42d09282-b092-4af4-b14d-5319b52b475e/solicitud_de_novio_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d890cacb-acdc-4630-9a04-1354758efddc/76504691279.pdfIn PDF document text
    • http://fegoluvarelewum.myartsonline.com/acupuncture_meridian_theory_and_acupuncture_points.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05938c2c-9b8d-45a8-9833-965f8700bfd0/little_shop_of_horrors_plant.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90B 4920 bytes
SHA-256: d8488828da8ecebda8741b5a254262ed31352fec809158c4a510a5eb3e1d077e
font_01_sfnt_off0000f9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AD 10784 bytes
SHA-256: bfb219a094057f1720194586b866183176d6bcb724a8b25b91ecdaec34e95feb