Malicious PDF — malware analysis report

Static analysis result for SHA-256 57d9812b0f75caac…

MALICIOUS

PDF

79.5 KB Created: 2021-04-06 23:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 733a8cc5937d45c0bb71ad8c88dc1c87 SHA-1: c0e407c32150b651ae49df1c7e8ae2f697309646 SHA-256: 57d9812b0f75caac12f7abbf3834af2e3c1e17fc41a4e36fd9ade6b52f93297d
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://zajinet.ru/wix?keyword=lennox+samuel+ari+pictures PDF link annotation
    • https://cdn.sqhk.co/lidabofob/tiejbts/scoring_ticket_to_ride_europe.pdfIn PDF document text
    • https://cdn.sqhk.co/zivuronufepu/tljfpif/34309864828.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454677/normal_605d52478edf2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497666/normal_5ffebb84396d2.pdfIn PDF document text
    • https://cdn.sqhk.co/pudamunipum/AhcBjbl/jotofetumusupu.pdfIn PDF document text
    • http://wwbook.org/gigenuvevakiqask9.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • https://luwojasog.weebly.com/uploads/1/3/1/3/131380471/nolaregati-pafapatabu-budutin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476947/normal_603c273bea9ac.pdfIn PDF document text
    • http://stopro.store/bogilubegimenoruwijoj4z7r.pdfIn PDF document text
    • https://kasitawudak.weebly.com/uploads/1/3/1/3/131380619/3632649.pdfIn PDF document text
    • https://cdn.sqhk.co/rujiwujik/gJ5gdgd/demise_of_nations_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/viwitukaz/hixhgig/xumuvinuwejujesukolasejo.pdfIn PDF document text
    • https://xitirume.weebly.com/uploads/1/3/4/3/134392652/4958584.pdfIn PDF document text
    • https://cdn.sqhk.co/zokuwagopole/Qheheia/qualifications_to_become_president_of_the_usa.pdfIn PDF document text
    • https://cdn.sqhk.co/zunezafi/jhiJElf/transformers_robots_in_disguise_2001_characters.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448345/normal_602cb6054e805.pdfIn PDF document text
    • http://activa-fb.com/alnoor_diagnostic_lab_online_reportsrugg7.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutorixo/G3whjtV/zovaxefitifoxi.pdfIn PDF document text
    • http://rimka.xyz/1800864125f2w6f.pdfIn PDF document text
    • https://cdn.sqhk.co/kipasewimoni/jc8IShc/dopofedimixufez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7437ccb7-8a0e-474a-a477-9c9f242599df/star_wars_visual_dictionary_boba_fett.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6fbdfde-7928-49a8-94cc-163b6311da88/83040154482.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e76ba17d-8090-4b35-8ae5-242d202decc6/turonerufazumataxif.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_off0000f55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55B 5088 bytes
SHA-256: 800acf3ecca0fbfdc948270a6f17ffd88f068ac21e2534586271137c535fac94
font_01_sfnt_off00010696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10696 12148 bytes
SHA-256: ea70f0f932bd72cf177c2380c02028de4a6f2761506e08ac52e091c15a75aba6