Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a20c96b2dc2d42b…

MALICIOUS

PDF

76.9 KB Created: 2021-03-18 17:37:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 099853f656532b88c47f01243611156f SHA-1: b0c76cdc1649e45357bb26365f012aed6afd1dad SHA-256: 1a20c96b2dc2d42b20379e5b8e35b6a57db149af9cbb7cf404c606e955a32c3d
226 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO poisoning tactic. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document may be instructing users to decrypt an archive, a common method to bypass gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://baarspo.ru/wix?keyword=1996+jeep+grand+cherokee+fuse+panel+diagram PDF link annotation
    • http://hookup668.site/what_jobs_can_i_get_with_a_data_science_degreeerqju.pdfIn PDF document text
    • https://cdn.sqhk.co/febenapox/hgngagh/past_present_future_bible_quotes.pdfIn PDF document text
    • https://cdn.sqhk.co/sifajoxojif/qjjgcjd/hornblower_cruise_san_francisco_valentine_s_day.pdfIn PDF document text
    • http://axecheat5.xyz/miller_xmt_304_cc_cv_service_manuale4trw.pdfIn PDF document text
    • https://cdn.sqhk.co/pabopimi/ceiju07/86730596626.pdfIn PDF document text
    • http://natorg.fun/gagevuxetizevsmlhv.pdfIn PDF document text
    • http://paypallsecurity.com/pioneer_avic-5100nex_password_reset06032.pdfIn PDF document text
    • http://voyazh-shina.com/wipaxenituvotikazdwxx9.pdfIn PDF document text
    • https://cdn.sqhk.co/xamapetarel/hqgcdie/98659028280.pdfIn PDF document text
    • https://kuxilididid.weebly.com/uploads/1/3/4/3/134387830/4e400ea2ec.pdfIn PDF document text
    • http://trysoda.club/19708695125pvqej.pdfIn PDF document text
    • https://ralerafuzirepob.weebly.com/uploads/1/3/4/3/134386916/ziwibidomafagodi.pdfIn PDF document text
    • https://rorefodelubo.weebly.com/uploads/1/3/1/4/131452934/c8f592ad0.pdfIn PDF document text
    • http://smeshnoykir.space/singer_simple_2263_threadingfy08l.pdfIn PDF document text
    • https://cdn.sqhk.co/nogawevorus/ekLHif6/10152752187.pdfIn PDF document text
    • https://nekitunanozot.weebly.com/uploads/1/3/5/3/135346928/9444134.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/af4c4261-0947-48d9-9d12-a89cb26d0311/la_luz_del_mundo_lider_en_la_carcel.pdfIn PDF document text
    • https://4eff3ec4-d147-45d1-be73-876d9e1d0019.filesusr.com/ugd/efb3f0_ec4ecf7e04994d798967c7ee6f781d0d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/07ad9e99-24a5-4f75-b055-d9d26d32cf35/pemixubudufibifepuvarazu.pdfIn PDF document text
    • https://1cbf0fd9-62af-4102-a3dc-982f361539e7.filesusr.com/ugd/bfbc46_f8850bfc0a6b49a6b16f9d4b4556ae57.pdf?index=trueIn 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_off0000ee8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8A 5976 bytes
SHA-256: 7bee98a8be78d025ddb1b2b6cc5efaad31b51db2f0cc3f5bf8fa2b488874e851
font_01_sfnt_off000102c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C1 10436 bytes
SHA-256: 58097904a91d4814d54323aac3c5b0268eb8876e2a0687d8c457c8e5de661991