Malicious PDF — malware analysis report

Static analysis result for SHA-256 25e3e40b0c046f56…

MALICIOUS

PDF

75.5 KB Created: 2021-04-07 18:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3cb8150f50dc90c3c6b85b9f563b66b4 SHA-1: 1697fc49c545f769fd6e199134a2dc7fe57a2e96 SHA-256: 25e3e40b0c046f5681306e6eca45a8e7fd0d09c1cdcff03d0395eba1d88f2c4c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9999

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://xajibur.ru/strik?utm_term=carry+on+rules+liquids PDF link annotation
    • http://zuvilivupeke.iblogger.org/air_pollution_mini_project.pdfIn PDF document text
    • https://cdn.sqhk.co/mogudekusab/iehgheV/free_police_ringtones_sound_effects.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484815/normal_5fe6b3d11c7c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450139/normal_5fec674ad705f.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwonesi/Hif9Pjb/xifatorebotokoviwu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473947/normal_60597f5d13eca.pdfIn PDF document text
    • http://suporefebakibur.mygamesonline.org/free_vegetarian_keto_meal_plan.pdfIn PDF document text
    • http://wupidubame.mywebcommunity.org/la_casa_de_bernarda_alba_cervantes_virtual.pdfIn PDF document text
    • http://xemokajoled.medianewsonline.com/rinomepa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cc4f1b1a-08c7-467e-bb5a-e3073ad8caf1.filesusr.com/ugd/ffc175_b5983b5204e149ebb3be2b57fe688fc4.pdf?index=trueIn PDF document text
    • http://devagejoga.rf.gd/fifezosojemij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e617e28f-2024-478c-b7d3-2b1a9e1d6c31/79192015769.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2eb47833-5bf9-4189-9f62-a51d7bb4981d/firex_smoke_detector_recycling.pdfIn PDF document text
    • https://ede36962-9452-4451-b182-fa4236ba9bc6.filesusr.com/ugd/83b1b3_32d6fdeafffa44518628af73e8996259.pdf?index=trueIn PDF document text
    • http://jojemoditupu.rf.gd/gce_2019_maths_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2bc989c-58d9-487f-a58b-306f9e2a4320/37137926994.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3d2044a-8af2-470a-a0c4-662f6e1a70ca/what_is_a_remote_collar_for_dogs.pdfIn PDF document text
    • https://40e214c1-1950-44e8-a195-e2c6eeb23253.filesusr.com/ugd/a517f4_fa38e53b55fb4beba6eed60d0ba94244.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_off0000eba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA0 4952 bytes
SHA-256: fed939351211d5e349875f12523cf7564e7076196e7f280c46c811ded4f2b794
font_01_sfnt_off0000fc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC88 10280 bytes
SHA-256: e055b9c7a7a07c7c3e009512ab32ba89bf6d015b8fbb55b93dbea0225441fafe

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