Malicious PDF — malware analysis report

Static analysis result for SHA-256 8907541fc75ac2e5…

MALICIOUS

PDF

73.6 KB Created: 2021-03-01 20:29:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f8de3d9ef3eedaea75bc0519dc392115 SHA-1: 7ab93e6b59544d4d18d951ca966d39fc213d4b32 SHA-256: 8907541fc75ac2e586ba9ef7f2edcc1733963f18f25a7f2326dda619d1ff8522
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary focus on redirecting users to a malicious domain disguised as a search result. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://gimoguvi.ru/strik?utm_term=how+to+learn+english+meaning PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4451230/normal_5fcf5e11629c9.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/xomefafavadadukemebepana.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447903/normal_603358bbf1f29.pdfIn PDF document text
    • http://lajodibibodi.getenjoyment.net/wideluferid.pdfIn PDF document text
    • http://texoraw.sportsontheweb.net/what_is_taco_bells_new_5_box.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455901/normal_5fd28ac54c27e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383464/normal_60037a9b8a7e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393503/normal_5ff3d7ab81da3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393890/normal_5fdb5d58933c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369907/normal_601fd38e80e1c.pdfIn PDF document text
    • http://pozijuza.scienceontheweb.net/do_you_need_to_use_the_water_filter_in_the_keurig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386073/normal_5fcd055d3a6c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417308/normal_601bb76231548.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480904/normal_601bd2ecd2224.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480579/normal_6010889048c25.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jeromisixinolib/rpg_maker_vx_ace_game_freezes.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/adobe_air_runtime_android.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/givizalokemapexu.pdfIn PDF document text
    • http://losotejusegiso.rf.gd/68934691080.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_off0000e43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43C 5152 bytes
SHA-256: 7bca368972778d2a9fda100fb6b9f76c117e7c2f7ea4f687f7ce2e9c4cbe560c
font_01_sfnt_off0000f5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A9 10412 bytes
SHA-256: 071edde9500670d3511474580151d5bcd64af37497a35d9c2a79cbdc6b97067d

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