Malicious PDF — malware analysis report

Static analysis result for SHA-256 f609945b88015b52…

MALICIOUS

PDF

178.3 KB Created: 2021-05-10 05:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: abf3593e5de68eaeb1c710a9da1663cd SHA-1: 280fb6c8194b0ea0d5c376c1ac19fe65998c45ae SHA-256: f609945b88015b52f1bf95d8e560d32e6efc5c937aff912013cdafeabdba8e9b
134 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is a link farm and uses a "free download" lure in its body text. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URL `https://pelibifir.ru/strik?utm_term=free+download+ubuntu+12.04+32+bit+iso+image` is a primary indicator of a potential phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pelibifir.ru/strik?utm_term=free+download+ubuntu+12.04+32+bit+iso+image PDF link annotation
    • http://perfectiona.online/why_is_my_sandisk_memory_card_not_workingnqe55.pdfIn PDF document text
    • http://zebolalifitu.22web.org/41843498796.pdfIn PDF document text
    • http://balizupi.iblogger.org/big_blue_party_speaker_not_charging.pdfIn PDF document text
    • http://katowad.22web.org/nozudiguduwusekiwop.pdfIn PDF document text
    • http://pelopof.iblogger.org/vuxekejusaxilanabikinasi.pdfIn PDF document text
    • http://callup.today/trigonometry_revision_ppt_tesvie28.pdfIn PDF document text
    • http://fomamiforepu.22web.org/lady_antebellum_albums_free.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/c184c8b1-fdc1-4609-9e1b-9ccb8e85ef4f/jimuziwejejotutu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6649738f-8bcb-4f4f-9ef3-fff269a31222/jikenaxalamiz.pdfIn PDF document text
    • https://6c8ebe11-725c-420b-823a-68bc39d02ad2.filesusr.com/ugd/3e87bf_91ab2e514b5d46a3b83fa22c1e702616.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/15b083e3-0c88-46f0-bfc7-bacbc7be71e9/how_to_make_your_own_driving_route_on_google_maps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07055b41-c7af-4f03-9f3a-d916bb45518b/27700890187.pdfIn PDF document text
    • http://marilineme.epizy.com/21622988791.pdfIn PDF document text
    • http://totefejat.epizy.com/diet_plan_for_high_cholesterol_patients.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9478283b-ec37-4e70-9f29-c8cc34fc8dc0/4247540531.pdfIn PDF document text
    • http://gapexer.rf.gd/between_the_sheets_home_store.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ae06632-3f3e-4029-aa11-4ef8f56d001e/45289789386.pdfIn PDF document text
    • http://vemilumawulab.epizy.com/halloween_history_worksheets.pdfIn PDF document text
    • https://e79dab91-b8ca-4f03-a7cf-74564eaa1d8a.filesusr.com/ugd/009cd4_a8b5754a17074d45b2db268858e2ab10.pdf?index=trueIn PDF document text
    • https://d2ffd92d-ad89-4e9b-8359-126286817a3c.filesusr.com/ugd/dd9784_1eb71f0c86004d69be78d62c07632d99.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b85938f9-fd00-4a3a-bf80-dd9a1a229fb3/la_biblia_hablada_en_espaol_completa_pelicula.pdfIn PDF document text
    • http://kopedox.epizy.com/xuxegasegalemu.pdfIn PDF document text
    • https://e29a9437-b0a5-48a6-9afa-908397ce514a.filesusr.com/ugd/16a9c1_fefc8a74bb8745d797062e64e7645978.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_off00027d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27D66 5940 bytes
SHA-256: 7192d0eaaeaf2d3218615a485847ab31d46a44bdc7bf77c31a0a468e2f746add
font_01_sfnt_off000291a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x291A7 12340 bytes
SHA-256: 651c30d10137b692f644829ee72b40dc0dfd637a6cce98b583320fddd0d1d25a