Malicious PDF — malware analysis report

Static analysis result for SHA-256 f012c0d3af54a44a…

MALICIOUS

PDF

90.8 KB Created: 2021-03-01 14:52:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: b664b6afa7c5d1eabc6eadf87fd20399 SHA-1: 2a97729c6bd1ad011be69580dc020dc2299d97b9 SHA-256: f012c0d3af54a44a1a2378e53f38bf11095220c2f69d785a88770702ddac6766
186 Risk Score

Malware Insights

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

The PDF contains a mass of external links, identified as a link farm, with many pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs and the document's structure suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/wix?keyword=chapter+11+chemical+reactions+packet+answer+key PDF link annotation
    • http://vas-rem.ru/groth_lecture_notes_in_macroeconomics80wfs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367944/normal_601d59b231388.pdfIn PDF document text
    • https://tixowofo.weebly.com/uploads/1/3/4/5/134592641/bizuxuwaradusurokad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391319/normal_60154af2a84aa.pdfIn PDF document text
    • http://koolmaxt.online/fuxitesatibudumulukuunhat.pdfIn PDF document text
    • http://nanamojuvimujo.medianewsonline.com/70744556989.pdfIn PDF document text
    • http://bluebadge-support.com/kali_linux_full_coursesdppn.pdfIn PDF document text
    • http://1cats.space/christopher_hitchens_childhoodg2mmm.pdfIn PDF document text
    • http://jaxagogilexet.sportsontheweb.net/paratransit_application_sf_ca.pdfIn PDF document text
    • http://obzorov.site/vevelibodajowovapu3eee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412173/normal_60336d1e5c5fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486763/normal_60144b605fa57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426572/normal_5fdeed4ce9031.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://loxupib.rf.gd/how_to_fax_from_epson_wf-2630.pdfIn PDF document text
    • http://xekabotiwuker.atwebpages.com/what_is_a_metered_water_softener.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11034 5388 bytes
SHA-256: c70fa4146753532d5d22fe723f892a7b54e1bdb9dc8305e505b73f6c34bb065e
font_01_sfnt_off00012271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12271 11136 bytes
SHA-256: 13d910847971715a4be474c2154f945db1b5dd8b2aad5cb478c6a283ef0f2597
font_02_sfnt_off00014882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14882 16184 bytes
SHA-256: dcc4c0abc0890442b0fa2aa32d0d4460407ba6a80c6f9f092138d4912a9fa5ed