Malicious PDF — malware analysis report

Static analysis result for SHA-256 293218cf02592898…

MALICIOUS

PDF

76.7 KB Created: 2021-03-28 20:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 84d4db7abeb68b2deaed77f33a624258 SHA-1: e6b316c3b225aef1423d160df4711f4516e32fb5 SHA-256: 293218cf025928982724df6ebe0588ad7cd0439d8873f2e114e70e6dbe090f09
186 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, and it contains a large number of external links, many hosted on disposable domains. The PDF_SEO_LINK_FARM heuristic indicates a deliberate attempt to create a link farm, a common tactic for distributing malicious content or conducting phishing operations. While no scripts were explicitly extracted, the nature of the link farm suggests the PDF's primary function is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/123?utm_term=ad+blocking+web+browser+android PDF link annotation
    • https://kezikiwagoxarud.weebly.com/uploads/1/3/0/7/130739267/7260346.pdfIn PDF document text
    • https://fibukumaguwin.weebly.com/uploads/1/3/4/7/134770434/lajiteda.pdfIn PDF document text
    • https://xoxovumalojiru.weebly.com/uploads/1/3/0/8/130874224/921786.pdfIn PDF document text
    • https://lisogawe.weebly.com/uploads/1/3/5/3/135312855/1185167.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369317/normal_6060065ac506e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418791/normal_605d7a94ce470.pdfIn PDF document text
    • https://mefevujeloz.weebly.com/uploads/1/3/4/3/134317202/dabagaviju.pdfIn PDF document text
    • https://kefexogutifega.weebly.com/uploads/1/3/5/3/135309882/5a8cb0f84296c.pdfIn PDF document text
    • https://sibolapitabake.weebly.com/uploads/1/3/4/4/134469628/7613477.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380392/normal_60511277d59e4.pdfIn PDF document text
    • https://setabuzi.weebly.com/uploads/1/3/0/7/130775645/6851097.pdfIn PDF document text
    • http://moratelusubuzol.22web.org/letter_d_worksheet_preschool.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462985/normal_5fe071caaebee.pdfIn PDF document text
    • https://virubavu.weebly.com/uploads/1/3/4/7/134755547/290a5f4f44c.pdfIn PDF document text
    • https://duzopuxezofuj.weebly.com/uploads/1/3/1/3/131382696/tedasubod_wuravadozenox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462730/normal_5ffcfec0ae9cf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/define_straw_man_plan.pdfIn PDF document text
    • http://posivunoloreweb.rf.gd/map_of_the_soul_persona_book.pdfIn PDF document text
    • http://lawurukipajuxe.rf.gd/bookkeeping_basics_for_small_business.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/suxixovipazo.pdfIn PDF document text
    • http://wifeturarotalov.rf.gd/attacking_network_protocols_download.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_off0000e526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE526 5392 bytes
SHA-256: c929cc8831691c9d2ec2ec7d2bf4aa858947d443f509a3b86d176d63383f7d85
font_01_sfnt_off0000f79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79B 13692 bytes
SHA-256: 96a8cbf6e8365083106ea3ae687af993c5de5cba2798136e9c2dce2b25a7d393

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