Malicious PDF — malware analysis report

Static analysis result for SHA-256 26e4e3657fc9a6dc…

MALICIOUS

PDF

67.2 KB Created: 2021-02-21 10:19:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9d350d9b8da939a537343153db4acd4d SHA-1: ff677e9d81e926430192edaf141545d0ee65d250 SHA-256: 26e4e3657fc9a6dcac49ccdf5e82aaf0445f6fe9370ce15a6e982b16d3550319
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting. The embedded URLs, such as https://jacksth.ru/wb?keyword=trane%20xe1000%20thermostat%20wiring%20diagram, suggest a lure to a potentially malicious site. Although no scripts were explicitly extracted, the PDF structure and the nature of the URLs point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://jacksth.ru/wb?keyword=trane%20xe1000%20thermostat%20wiring%20diagram PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4389586/normal_5ff5775731edc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449779/normal_600ea844ea714.pdfIn PDF document text
    • http://gebojiwikidavu.iblogger.org/xipidabowivejawuvikawik.pdfIn PDF document text
    • https://cdn.sqhk.co/dawezizupata/jgjji2M/surf_shack_subs.pdfIn PDF document text
    • http://lovepositions.info/lapujolexurojojefogepajpdzlh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485578/normal_6017f72174efe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450350/normal_602aa9b8355f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469837/normal_5fe939f232b04.pdfIn PDF document text
    • http://copyrighthelp.info/real_followers_for_instagram_app_free_download59kfg.pdfIn PDF document text
    • http://marketes.pro/telephone_with_answering_machine_reviewsuj79i.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380536/normal_6004a0c2cb447.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408346/normal_60174be611e1d.pdfIn PDF document text
    • http://jobs-ingenieur.best/1257096826k3t8s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453338/normal_60283d4418065.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/RgckBhb/97218058930.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380076/normal_5fee098099361.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493579/normal_6003cd6b67b0c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kametazita.rf.gd/jadaforitaguwiluwudifetom.pdfIn PDF document text
    • http://tasukifuputuf.epizy.com/piano_sheet_music_for_beginners_amazing_grace.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE64 5296 bytes
SHA-256: 131e8cc15478a76e651f7f7fab15e16dff876dd28dd8408e8cb38dad238e7f0e
font_01_sfnt_off0000d049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD049 9712 bytes
SHA-256: fc7ee3ad7e3322fa73bbe61b9a0dfc7698da4414c5159bfa1bda315625ab4134
font_02_sfnt_off0000f195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF195 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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