Malicious PDF — malware analysis report

Static analysis result for SHA-256 885546b1f682dc38…

MALICIOUS

PDF

106.7 KB Created: 2021-03-19 11:26:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 35ef4d36c0b8afe5adbe54d396899dae SHA-1: bfbf9628159a7718d977fa4f9b2e19d8168e82a2 SHA-256: 885546b1f682dc38a20a2d47861707deb8737ada74f254f8139e2fa402836a7b
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO poisoning tactic to distribute malicious content. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://xezojetit.ru/award?keyword=neumonia+por+varicela+en+adultos+pdf PDF link annotation
    • https://jagalanir.weebly.com/uploads/1/3/1/0/131071056/1964514.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464995/normal_5fced165e142f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370294/normal_603597f945ae3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454681/normal_60488f79a2e06.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380393/normal_6006023447360.pdfIn PDF document text
    • http://xojuxelase.medianewsonline.com/how_to_fix_volume_on_directv_genie_remote.pdfIn PDF document text
    • http://giwudogor.scienceontheweb.net/jifuxemuxirinotinog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460055/normal_6041439684248.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391907/normal_602d08d1991d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471512/normal_601e5b6491e97.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405929/normal_5ff92c5d92929.pdfIn PDF document text
    • http://lupelisizi.medianewsonline.com/dont_let_me_be_lonely_claudia_rankine_ebook.pdfIn PDF document text
    • http://lilozekakotelup.sportsontheweb.net/what_are_the_concepts_of_strategic_management.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472764/normal_5fd3b51eb757b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466391/normal_603bcaadedb33.pdfIn PDF document text
    • https://gimepokik.weebly.com/uploads/1/3/1/6/131636980/kadizug-zibipodakewape-xotux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_154d5fef59774c74879f4c65dd3aff0a.pdf?index=trueIn PDF document text
    • http://wafubarig.epizy.com/adobe_flash_player_10._2_installer_free.pdfIn PDF document text
    • http://zadumurimigi.epizy.com/figotaludove.pdfIn PDF document text
    • https://d4996ccb-aecf-47c4-aab6-3c4fe022e1b7.filesusr.com/ugd/b7ed05_f0abe3a263b6450e98d1705aa4cdfd6f.pdf?index=trueIn PDF document text
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_7b0f84a921a4401f9c3889a944d4a07c.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_off00014964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14964 5332 bytes
SHA-256: e518196d25b41e051985e1997b419d9d66bc7d54fded8e736f0a10c3df1dd004
font_01_sfnt_off00015b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B76 13400 bytes
SHA-256: 08cda33be7d049e3f047c621863fbd2374161c094417170c7f20a235ed22b42a
font_02_sfnt_off000186e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186E1 16200 bytes
SHA-256: 8ddacc8f93ef0c57a6c7d9a954163b655157744dfb68b175f08700f2b2876ec7