Malicious PDF — malware analysis report

Static analysis result for SHA-256 49366fcfb1a3908d…

MALICIOUS

PDF

81.3 KB Created: 2021-03-17 22:16:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: aa035fe969988235b2e278c06e0a063a SHA-1: ea074c082a7458aefa22d3b59b4942a674b16430 SHA-256: 49366fcfb1a3908deaf4e836cc7f5e7a5c1b4b14a6ef5bcd2f042205f6be4b10
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://pelibifir.ru/123?utm_term=b+v+rao+world+history+pdf+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460233/normal_60312752e7d51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445889/normal_601d3370c0e6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445880/normal_602e475ea6c17.pdfIn PDF document text
    • http://pikaromabunoteb.iblogger.org/6474754032.pdfIn PDF document text
    • http://1offpark.xyz/roule_galette_petite_sections7sbv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377102/normal_603a777b9a0fe.pdfIn PDF document text
    • http://doorstepcomputers.com/wopaxoforyfdqu.pdfIn PDF document text
    • http://gratoraama.space/dragon_village_2_dragon_collection_rpg_mod_apkiu609.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456989/normal_604d2035789f1.pdfIn PDF document text
    • http://idem-peshkom.ru/andrew_wommack_healing_university2lr5w.pdfIn PDF document text
    • http://rabota-plus.club/47659187792o7srz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494433/normal_6005c3507a170.pdfIn PDF document text
    • http://verifedform.com/456089234708o0q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465136/normal_6032b7eb3d2a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408871/normal_6045eaab77a67.pdfIn PDF document text
    • http://netewe9.xyz/48737510754yxy10.pdfIn PDF document text
    • http://top-odejda.com/hp_envy_4500_e-all-in-one_printer_wireless_setupjv0dt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zuzimadatunukag.rf.gd/balsamiq_mockups_tutorial.pdfIn PDF document text
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_76d5768f72784ddc8b6b39a1e00a3963.pdf?index=trueIn PDF document text
    • https://6db1e9a2-4282-4636-8d41-de07325ad911.filesusr.com/ugd/d97b38_21e8d95e4c7b4b2b9725ea930d711f8d.pdf?index=trueIn PDF document text
    • http://rulukufijozijud.rf.gd/comment_assembler_plusieurs_en_un.pdfIn PDF document text
    • https://a5a7f18c-b887-48a0-80cc-3627c14345d5.filesusr.com/ugd/609f59_849a6807f95c473ea68d1c9dd975b025.pdf?index=trueIn PDF document text
    • http://pazatirademe.rf.gd/tp-_link_archer_c50_ac1200_manual.pdfIn PDF document text
    • https://113c517c-d7b0-4b36-99d7-6722bcb7ef36.filesusr.com/ugd/8e66a5_e0bde6b93b0348f1b055f628c0d344fd.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE25 5116 bytes
SHA-256: 18c766fcca8927f61000a08edd432b7193eb69a8034ec1f5a0101961d0259a2c
font_01_sfnt_off0000ffbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBB 11752 bytes
SHA-256: b319263b6636fb8dc2e0943bb0c94671fdab5c07e163aa077cf3263175f03c37
font_02_sfnt_off0001279d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279D 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378