Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcbf364fde1a4451…

MALICIOUS

PDF

79.8 KB Created: 2021-03-06 14:22:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ce503b76ec82b8db48f99d54dcd9a031 SHA-1: b55777e24ff099444ee26f19afb63a3581b150a7 SHA-256: fcbf364fde1a4451513065e5e876d0c1a2a266b04e74a8ad39bca38f6c87f53e
194 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm designed to redirect users. The document body, though heavily obfuscated, contains references to a 'free download' lure, and embedded URLs point to domains that host numerous other PDF files, suggesting a phishing or malware distribution scheme. The presence of external URIs and a link farm indicates an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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://bologen.ru/strik?utm_term=dungeon+master%2527s+guide+5e+pdf+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476927/normal_600d45673eb87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476924/normal_60357a00e49e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476122/normal_602599273c575.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465543/normal_602c30d0c489f.pdfIn PDF document text
    • http://katorewudejizut.22web.org/the_displacement_of_an_oscillating_object_as_a_function_of_time_is_shown_in_the_figure_figure_1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470524/normal_5fe686ef9b2ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423145/normal_6025e90324f00.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421778/normal_5fdeefe259a5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369158/normal_601c6b126365e.pdfIn PDF document text
    • http://waguzeb.66ghz.com/fuller_house_tv_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459914/normal_5fd8cc7a1715b.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
    • https://s3.amazonaws.com/kudufigunabi/schumacher_battery_charger_circuit_breaker.pdfIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/koradapumojomokujolitedu.pdfIn PDF document text
    • https://2aa89031-56ac-4de1-b828-aabe99840ec8.filesusr.com/ugd/cf14a4_d7d2e82d685a4b33a34c8f6f1f356fbc.pdf?index=trueIn PDF document text
    • http://rexivire.epizy.com/card_games_for_windows_8.pdfIn PDF document text
    • https://6363ce23-9394-4102-a476-7be320345719.filesusr.com/ugd/7c41c1_fbdfed6fdc9b48a8805e86c8f905619f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/laginekux/abridged_accounts_consent_template.pdfIn PDF document text
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_851dc309e3844125a83542443eb914a0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/negonanopix/815935242.pdfIn PDF document text
    • https://2e5cbe44-7de3-4e3f-b94c-8a8567814465.filesusr.com/ugd/f96b02_7753fe6377bf4a9287686b778d69e757.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_off0000e730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE730 5492 bytes
SHA-256: ce6da576874d1be79a0443e209bb9fb84ff209a9a18e9a07a614794c99bd8791
font_01_sfnt_off0000f9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DF 12896 bytes
SHA-256: 4c2a693daad49208691264a29fb50c5ff9083edc2a949b65061778e15cf8b10c
font_02_sfnt_off000123d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D8 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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