Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ba198f05ed7c38e…

MALICIOUS

PDF

76.8 KB Created: 2021-04-04 23:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 910d4c179572ec537ff64583a6382abd SHA-1: d32eba902be83c79ca8aeaf009c4066d41eb05c6 SHA-256: 0ba198f05ed7c38e0ea3d2ca490c4c781416f8e3568c59a052d2beb47691f4d5
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to disposable hosting and employing UTM parameters, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

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://mezovuduw.ru/strik?utm_term=dbt+skills+group+nyc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501028/normal_60690f9db715a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497131/normal_603fe68105e37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418385/normal_6045f11234a7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476133/normal_602fb1de0a690.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368500/normal_60609b9531bd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493888/normal_6065efe0bfc9f.pdfIn PDF document text
    • http://sadesopawu.iblogger.org/arduino_uno_pwm_pins_timers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468270/normal_6032b92150653.pdfIn PDF document text
    • http://gilutij.iblogger.org/79887942131.pdfIn PDF document text
    • http://pugalibapuf.iblogger.org/ez_grow_broadcast_spreader_by_republic.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382965/normal_5feff72aafe0c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xerunutogufoj.epizy.com/17837413092.pdfIn PDF document text
    • http://popirarubinuluk.rf.gd/fapopopatakidifexobino.pdfIn PDF document text
    • https://fdb0147f-387d-4908-9c93-1ccdb5bf775f.filesusr.com/ugd/aea2e0_16f07ff2b8814261af73b7ebceae9cca.pdf?index=trueIn PDF document text
    • https://72cdfa97-b5fe-44cc-9aa9-3142b5aa642a.filesusr.com/ugd/ee32c9_6e0fb3ebb3e945f78004e6d4c117b7e6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tuletivotarupu/stokke_xplory_v6_manual.pdfIn PDF document text
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_11bdaeff4fe44f358d571af5bd4e95be.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sazomo/certificate_of_origin_template_word_doc.pdfIn PDF document text
    • https://ba85394b-11ac-4ca4-926b-74ca936c52e1.filesusr.com/ugd/5ccfc8_9576f2a8adc941d19b9152b397a35f39.pdf?index=trueIn PDF document text
    • https://200c4c3d-185b-4246-b99f-f40cd7065c99.filesusr.com/ugd/3ed902_fc4f59af22b7495f833cd06d4d719e10.pdf?index=trueIn PDF document text
    • http://sojugixu.epizy.com/81639633029.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_off0000f057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF057 5196 bytes
SHA-256: 112d03e71152ff93abee3cd25c857cce7a0e53dda49b22201023e686722d87ac
font_01_sfnt_off00010226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10226 10520 bytes
SHA-256: c5a0beb121240b40c1ddd0748c75d5feed538ce29d1667cc1ee61c7a69c8c29b