Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b81ff6a1b3f0558…

MALICIOUS

PDF

86.5 KB Created: 2021-02-20 03:53:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: c634688829f989811c4efa82cae07e8e SHA-1: 9fd11d3fe9c5895136195b1d1af4e448a26f38e8 SHA-256: 3b81ff6a1b3f0558a17231fc9e959f1bd97aeac82415467007bbffc253a5657e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable hosting and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://baarspo.ru/strik?utm_term=what+do+mean+by+planned+economy PDF link annotation
    • https://lorudopop.weebly.com/uploads/1/3/4/3/134315835/nudodedetafuvom.pdfIn PDF document text
    • http://community-day.ru/plan_dentrainement_half_ironman9fxi7.pdfIn PDF document text
    • https://pinobuni.weebly.com/uploads/1/3/0/9/130969003/7906178.pdfIn PDF document text
    • https://cdn.sqhk.co/nokotadi/ggmuuhb/vomujekesu.pdfIn PDF document text
    • https://cdn.sqhk.co/jojikoxazew/fhd6VUU/messenger_download_apkmirror.pdfIn PDF document text
    • https://muwilumi.weebly.com/uploads/1/3/0/8/130813533/sutavamomupi.pdfIn PDF document text
    • http://nibelv.xyz/download_x360ce_emulator_for_pcwsylv.pdfIn PDF document text
    • http://zalewef.iblogger.org/89674927768.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455894/normal_5ffb455123935.pdfIn PDF document text
    • https://cdn.sqhk.co/wujozuzewed/haehaRL/download_game_badminton_league_2020_mod_apk_offline.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388815/normal_6000503f5832f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487208/normal_5fd2d3edb1bff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/befafuni/rifasodejasotemari.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/low_voltage_surge_arrester_selection_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/judutonisuzadapojurojed.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_off000114f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F4 5292 bytes
SHA-256: c26568e4c0751e391bcca3aa07b854ec641d5cb3fe88a5af51f5cf8f11615741
font_01_sfnt_off000126e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E3 11196 bytes
SHA-256: 7898d01ce32e8df8ff418f16d6c835438a466b21886fe9716551208ab05f6950

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