Malicious PDF — malware analysis report

Static analysis result for SHA-256 a13fd257e02c0b67…

MALICIOUS

PDF

75.4 KB Created: 2021-02-27 22:56:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ab02a981d21e4954e7d737318db05c33 SHA-1: 56a96f9feca028e9ce814b41020ef33b219b001d SHA-256: a13fd257e02c0b6718282f2ed9631d3fd4c41e56ae5f1cd83bb30297c1f38deb
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are 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 embedded URLs point towards a phishing or malware distribution vector, likely using embedded JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/wix?keyword=philips+tv+repair+service PDF link annotation
    • https://cdn.sqhk.co/zetoreli/ijhhjfL/dugumupijumezolesar.pdfIn PDF document text
    • http://erogan-columbia.site/suxomigibusutnag.pdfIn PDF document text
    • https://cdn.sqhk.co/moturalogupe/bwZjhgi/ribanemewapupofixaxewow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477181/normal_6039250661615.pdfIn PDF document text
    • http://uaregroup.com/metal_cutting_band_saw_blades_guide3y606.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424692/normal_6033cd19a7b75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405409/normal_60301b1c4faf0.pdfIn PDF document text
    • http://alkim.xyz/bihar_geet_video_songqu051.pdfIn PDF document text
    • http://table-wait.com/47754558294u4eqx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475562/normal_600e7a27bf236.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470698/normal_5fc858c396363.pdfIn PDF document text
    • http://nat-fru.space/rukarunwbusu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485813/normal_60377c01a8f49.pdfIn PDF document text
    • http://xtrading.buzz/998457821610mluo.pdfIn PDF document text
    • https://cdn.sqhk.co/litawoxelida/MgcRTha/idle_tap_cinema.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427506/normal_6031827fa7120.pdfIn PDF document text
    • https://cdn.sqhk.co/dukosisevu/DXjagcw/gba_emulator_android_roms_deutsch.pdfIn PDF document text
    • http://rineset.xyz/wojajolorunosovexuvarkujag.pdfIn PDF document text
    • https://cdn.sqhk.co/wujejelot/aLpif2n/tiere_stricken_kostenlose_anleitung.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409801/normal_603549945611a.pdfIn PDF document text
    • http://passive-income.ru/baguketozamonixegukajhbzf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE852 5084 bytes
SHA-256: af6f0b96ed9bbddec30e42ab66b35fd7eb22f5e0a3d55ff39bbaafbb8cbaac40
font_01_sfnt_off0000f999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF999 11460 bytes
SHA-256: 1e8b17871959de0b37232d349977dd34f481168927b8994fa96e1b6aefcaffc1

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