Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2317e421398ba5b…

MALICIOUS

PDF

74.6 KB Created: 2021-02-16 07:58:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 724719b849c0efcedcf67f6d947ab07c SHA-1: e7408e351c43534ba010136bc54d6cd78e6eb54e SHA-256: b2317e421398ba5b80bc7a9930109ce79fa89de2bef1ed12c1ea110ae07a1840
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that is likely part of a phishing or malware distribution scheme, disguised with a seemingly relevant search term. The document body, though heavily obfuscated, contains references to wkhtmltopdf and Qt, suggesting it was generated by a tool rather than being a legitimate document.

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://druttle.ru/strik?utm_term=civil+engineering+books+for+gate+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4401517/normal_5fe4018828222.pdfIn PDF document text
    • https://jobeluke.weebly.com/uploads/1/3/5/3/135318189/gonenawewazawaz.pdfIn PDF document text
    • https://dorizusedi.weebly.com/uploads/1/3/0/7/130776489/nodasude.pdfIn PDF document text
    • https://nulepapilix.weebly.com/uploads/1/3/5/9/135957677/4142657.pdfIn PDF document text
    • http://899themes-demo.ru/jijasopedokimewq9q3.pdfIn PDF document text
    • https://banetopebored.weebly.com/uploads/1/3/4/8/134874573/7090706.pdfIn PDF document text
    • http://ketrovk.xyz/db_super_free_wallpaper_hd_1080x1920kzwra.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409425/normal_5fe91b7f2b671.pdfIn PDF document text
    • http://ximasoj.22web.org/faritu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428039/normal_5fdae9a71ce1f.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/senodiw/cmake_command_line.pdfIn PDF document text
    • http://xafexepov.epizy.com/cadbury_malaysia_annual_report_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/gogunabones/bottle_feeding_guidelines_nhs.pdfIn PDF document text
    • http://xumomevafuvozup.rf.gd/jagatunakega.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/amit_bhadana_song_video.pdfIn PDF document text
    • http://pititonekeget.epizy.com/ayso_united_coaching_manual.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_off0000e906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE906 5380 bytes
SHA-256: 1c4f0b34e1c5fb9681f6bf43a34005d6ea9c365d21a49b1601437cd3479e1dc9
font_01_sfnt_off0000fb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB61 9948 bytes
SHA-256: b837ab9f35e0dae8e889d826064c1010982ca1b4a39338c8e3d4b2959eb90633

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