Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a13b525314b79a4…

MALICIOUS

PDF

74.4 KB Created: 2021-03-14 13:38:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 29460c7343dff649de9d3f97dc1981a0 SHA-1: 5c90f679562c6ca8343b6e19d82380c334df19fa SHA-256: 9a13b525314b79a43e763bc3e41331fb07356d45310c8b4474d93a6c10aa1df1
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 0.9998

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://mezovuduw.ru/wix?keyword=ti+nspire+cx+cas+manual+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391896/normal_6030d3bec30f5.pdfIn PDF document text
    • http://italonewsero.site/what_not_to_eat_at_keto_dieta0900.pdfIn PDF document text
    • http://riniwodifole.medianewsonline.com/is_the_guy_in_geralds_game_real.pdfIn PDF document text
    • http://jobs-ingenieur.best/22675424602hme0p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413975/normal_602fa77bb8d00.pdfIn PDF document text
    • http://milanomoda-italy.website/pezixezimisizs41p6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384029/normal_5fd725a0867c7.pdfIn PDF document text
    • http://wepijafiguwenan.mywebcommunity.org/13542300778.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414339/normal_5fddcce5abd3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444875/normal_600fa60fa097b.pdfIn PDF document text
    • http://2020coupons.info/are_rescue_pastilles_gluten_freesf3o8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426556/normal_60125fcb67120.pdfIn PDF document text
    • http://fobexugelego.getenjoyment.net/one_thousand_and_one_nights_is_a_famous_collection_of_short_stories.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491169/normal_5fe4e407908e4.pdfIn PDF document text
    • http://servisvds.ru/navy_bmr_app_not_workingphbv1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_5ebc7e3bee284f1e8d73547d83b6f4cb.pdf?index=trueIn PDF document text
    • https://cf268418-7549-4780-9cff-e39e61b5276c.filesusr.com/ugd/0b1cf2_0ffba91b9dfa4b968a2b1a1fb7116031.pdf?index=trueIn PDF document text
    • https://a2c67b61-a01d-4053-b7ad-f1487bca8054.filesusr.com/ugd/24853a_a9efefba75104ccda4b1c3b253e17daf.pdf?index=trueIn PDF document text
    • https://ede36962-9452-4451-b182-fa4236ba9bc6.filesusr.com/ugd/83b1b3_d9a327c672044bb99961b19f58998980.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
    • 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_off0000cebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBF 5320 bytes
SHA-256: abc360555738cdd7f8fd46f660b829bc101637077f57e901edceb704f4ee6047
font_01_sfnt_off0000e0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C4 11588 bytes
SHA-256: 434a245183479439c7fdb4896b41e5b5897908c954ea9610c43d29a020c8f779
font_02_sfnt_off000107ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AE 16060 bytes
SHA-256: d8a1a34de14a7b8fce5e51635835121d353d188f9ac9ce1e11538509fd4c5cdc