Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf6cdfcdb952107…

MALICIOUS

PDF

73.9 KB Created: 2021-03-27 11:05:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 13fa77d9c19cc1cd8447a32d247b374a SHA-1: eabff5128cedc413aef3c9b2370c6376eb210c57 SHA-256: 7bf6cdfcdb952107a1fe596eba7ac0f3de4c0a03c9664f8f51eff791a3b38048
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing 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 an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

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://golowaki.ru/award?keyword=advanced+excel+2020+formulas+tutorial+pdf PDF link annotation
    • https://kakerenu.weebly.com/uploads/1/3/1/0/131071145/0bd2f187db37728.pdfIn PDF document text
    • https://cdn.sqhk.co/mibajufaneja/ejcjeHh/whitman_coin_collection_holders.pdfIn PDF document text
    • https://cdn.sqhk.co/givesaxi/pxjgxge/exos_heroes_wiki_jp.pdfIn PDF document text
    • https://cdn.sqhk.co/bemememu/5gc3ifQ/download_smashing_rush_mod_apk_versi_terbaru.pdfIn PDF document text
    • https://gawozigojuvapa.weebly.com/uploads/1/3/4/8/134896601/aa35f0b2a755d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452626/normal_5fcacb713569c.pdfIn PDF document text
    • http://gerawat.22web.org/57481289586.pdfIn PDF document text
    • https://cdn.sqhk.co/pajokiman/Dgjiejd/konejadijanudal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460231/normal_5fe4e20a03481.pdfIn PDF document text
    • https://toriradusug.weebly.com/uploads/1/3/4/7/134744904/gunebulusivodab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499651/normal_6003edc832fa2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451941/normal_5ff0b8ee687b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454668/normal_5fce0bf9c38d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373297/normal_6008fae1bba23.pdfIn PDF document text
    • https://cdn.sqhk.co/gowexenopa/kCFEb61/cerebral_palsy_adalah.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391319/normal_5ff4c67299a48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409425/normal_600c351e4f094.pdfIn PDF document text
    • https://nedugapepo.weebly.com/uploads/1/3/4/2/134265444/9377846.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497688/normal_5fe8fda9c3898.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mubomapobe.epizy.com/sociological_research_proposal_format.pdfIn PDF document text
    • http://gulazefedonijo.epizy.com/official_announcement_template.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_off0000dd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6E 5692 bytes
SHA-256: 6b252e061d2c650883243839994c8026c40dccad6aeb01f6d3c5bf6239fb3596
font_01_sfnt_off0000f0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C1 11612 bytes
SHA-256: 564131fe09c900adf3befe23e719d14ec0cc66115f0506f25979be1e5e35b8a7