Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8a75450bcbf238f…

MALICIOUS

PDF

76.5 KB Created: 2021-03-19 05:09:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b02c339b82a85df72db8d6242e92b3a3 SHA-1: 25c150b25fdeb4357d38fb842da5a002127a3071 SHA-256: f8a75450bcbf238f4d6bf610b4aaea7d9ffeabb9e3e03f5c638d048206984970
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded document body text is heavily corrupted, preventing analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/strik?utm_term=voyager+legend+uc+plantronics PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4454824/normal_5fe37de816bfa.pdfIn PDF document text
    • https://gudosotavuna.weebly.com/uploads/1/3/4/7/134722070/1376994.pdfIn PDF document text
    • https://xuserufibizu.weebly.com/uploads/1/3/4/1/134131258/bagidotidewexujuxebu.pdfIn PDF document text
    • https://bokosemebejira.weebly.com/uploads/1/3/0/8/130813317/jewoxikafeloxuxezifu.pdfIn PDF document text
    • http://fodelogutejamit.getenjoyment.net/8025547147.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458614/normal_5fd10d7fa9fc2.pdfIn PDF document text
    • http://rowaxamapitowej.getenjoyment.net/molecular_biology_of_the_gene_questions_and_answers.pdfIn PDF document text
    • https://newavutija.weebly.com/uploads/1/3/1/8/131871734/51f0efa0e82.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420031/normal_5fefb79e41597.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451555/normal_600a42d13134a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366040/normal_5ffa97d954de7.pdfIn PDF document text
    • https://dufofumiwiz.weebly.com/uploads/1/3/5/3/135309849/4aa962d8864.pdfIn PDF document text
    • https://zupevinar.weebly.com/uploads/1/3/0/7/130739631/bofupidab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a1f0096d-76f5-425c-b826-5ccbd312c1bc.filesusr.com/ugd/8f8c07_bfbc5176b435494484b07ee042a583e3.pdf?index=trueIn PDF document text
    • http://zorijefugixor.atwebpages.com/descargar_la_biblia_reina_valera_1960_gratis_para_celulares.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e46fe829-cab7-4d8e-b531-558ba1b75af8/hp_elitedesk_800_g1_sff_specs.pdfIn PDF document text
    • https://71da2aa5-51c3-4f2c-ab18-08bbbad20131.filesusr.com/ugd/d216cb_de7d7d9e60604229aa8c8c8aaa7f7f6d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce2bb4f4-3c91-4460-ba45-e8802f3a237e/bupopowijojafebefufom.pdfIn PDF document text
    • https://d572dbd6-ec42-402e-884a-3db6daac2318.filesusr.com/ugd/6a558d_d001c2018c5f4dafae565195b4dc9987.pdf?index=trueIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_2951d27a57f44056b356b3eca7360159.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/95050391-73f4-42b1-a125-65990660d525/jeep_grand_cherokee_maintenance_schedule_2014.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_off0000e9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C4 5308 bytes
SHA-256: a625f5034fc7d95f49e07c1a5e83f23545d06c3c26f69b3300a1d7584e485a75
font_01_sfnt_off0000fbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEC 12144 bytes
SHA-256: e103ef322160aa6da5ac548eceb3f483ea26ecf666fabc07c6a777414fa44d7f