Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6d946717e4834dc…

MALICIOUS

PDF

68.6 KB Created: 2021-02-28 22:37:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 5d8cd7ff5f184e7178be3e1265113c6d SHA-1: 2d3c6360a5182963a00e5c1d23d9ea061ad76630 SHA-256: d6d946717e4834dc0c620e360ea588749cfa25d522ca72018d9dd654e3d0da5b
134 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection mechanism. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick the user into downloading a secondary payload or visiting a malicious site.

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 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/award?keyword=how+to+pair+tp+link+av500+powerline+adapter PDF link annotation
    • https://birifebirox.weebly.com/uploads/1/3/3/9/133999865/b19bbbb9a280148.pdfIn PDF document text
    • http://bewinizujatuw.iblogger.org/xusekasera.pdfIn PDF document text
    • https://gifetapajuloper.weebly.com/uploads/1/3/4/6/134682222/de8992a.pdfIn PDF document text
    • http://gitutemove.iblogger.org/mukixovuzotarumiviloz.pdfIn PDF document text
    • https://bugajujifupub.weebly.com/uploads/1/3/4/8/134894919/acb8ec4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pavasokunise.epizy.com/29137302071.pdfIn PDF document text
    • http://mepusafufeja.rf.gd/how_to_put_a_graco_snugride_35_back_together.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/2174956110.pdfIn PDF document text
    • http://zexeborora.rf.gd/43737337511.pdfIn PDF document text
    • http://telewazikenap.rf.gd/is_the_selection_coming_on_netflix.pdfIn PDF document text
    • http://nasukenapab.epizy.com/54227711727.pdfIn PDF document text
    • http://rurukiku.rf.gd/what_are_the_three_types_of_working_drawings.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/barcelona_aerobus_map.pdfIn PDF document text
    • http://koxaxinum.epizy.com/how_to_make_a_behaviour_management_plan.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_off0000cd34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD34 5220 bytes
SHA-256: 6d02e56595d7ff7505060d5d97cbf023e49e06315a8ae49dd6f390b5b1ffd0fb
font_01_sfnt_off0000df1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1A 10624 bytes
SHA-256: 35453c9234127924c5e670a050b628b2395a679bd50858f4392b37b771656f35

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