Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d99d98a86b2f47…

MALICIOUS

PDF

87.3 KB Created: 2021-01-20 05:31:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 27004ee8bc944b883fca6ab77132739f SHA-1: 9ef40261fbd4cc7cfb702117c027715b6591f982 SHA-256: b4d99d98a86b2f471ea9d265eddf4ac13f871c720341fea84359c5d291cdc2a3
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document delivery, potentially involving JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/123?utm_term=gloomhaven+tinkerer+strategy PDF link annotation
    • https://pepulumowuso.weebly.com/uploads/1/3/2/6/132681954/makixigexusiwar_dumefemi_nebuvipomux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464082/normal_5fcd66ec0dea8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499972/normal_5fc5934a0c8f2.pdfIn PDF document text
    • https://vonorakukipi.weebly.com/uploads/1/3/4/7/134721252/niraxinatojefiw.pdfIn PDF document text
    • https://dujomujur.weebly.com/uploads/1/3/4/8/134883281/1879629.pdfIn PDF document text
    • https://xinelonaveguv.weebly.com/uploads/1/3/4/6/134606197/luzimupem.pdfIn PDF document text
    • https://faliroralomi.weebly.com/uploads/1/3/0/8/130874474/c95774d83740.pdfIn PDF document text
    • https://sanajupa.weebly.com/uploads/1/3/1/4/131406847/naveduras.pdfIn PDF document text
    • https://cdn.sqhk.co/weralutofa/c7aqSja/faily_rocket_mod_apk_10._14.pdfIn PDF document text
    • https://cdn.sqhk.co/fixakozumad/hQPhjgh/wallpaper_for_laptop_black_and_red.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421058/normal_5fe615e34ed14.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mibesajaku.epizy.com/gastric_bypass_pre_op_diet.pdfIn PDF document text
    • http://wedutatitupaze.epizy.com/54584249655.pdfIn PDF document text
    • http://fuwuwiri.rf.gd/bajrangi_bhaijaan_movie_video_song_tinyjuke.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_off00011910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11910 5356 bytes
SHA-256: d62a00a7679a2ea03307c1855f4d65b032af38d25f43443182186c4ee4b7343a
font_01_sfnt_off00012b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B26 10812 bytes
SHA-256: 8b38f7168b78f9325ce3bccee21760f3a9d8a52b960f7c4608ee1a05738db8b4

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