Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe58c383e1add889…

MALICIOUS

PDF

84.7 KB Created: 2021-04-08 01:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6f9a340243ac8313bbd9d352db0a22e SHA-1: b34dc0823ab57b859654d5bf8dcb6cb3f6b0f32a SHA-256: fe58c383e1add8898cd6e72a6d2015649303a07568bb7a18e62fa333f01c490d
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs, with one prominent URL pointing to a domain associated with phishing and keyword stuffing. Heuristics indicate it's a link farm on disposable hosting, and ML classifiers strongly flag it as malicious. The ClamAV detection confirms its malicious nature, specifically as a phishing trojan.

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://midufefew.ru/wix?keyword=chapter+3+ecology+test+answers
    • https://wivesape.weebly.com/uploads/1/3/4/5/134510767/jakunemapajak_rakasadojigofe_vavokoke.pdf
    • https://kulaxewanugig.weebly.com/uploads/1/3/1/3/131384484/7569075.pdf
    • http://lezofifividex.scienceontheweb.net/cg_police_def_merit_list_2020_download.pdf
    • https://static.s123-cdn-static.com/uploads/4460066/normal_5ff3377d45ceb.pdf
    • https://debeseroduk.weebly.com/uploads/1/3/4/4/134467522/95c8e0076985f.pdf
    • https://cdn-cms.f-static.net/uploads/4426701/normal_602b61903e3f4.pdf
    • https://cdn.sqhk.co/sozodumupof/he8GVCI/visezazedavuza.pdf
    • http://kedugobepuged.mywebcommunity.org/26550132085.pdf
    • https://wuremuzagatixob.weebly.com/uploads/1/3/4/6/134612401/pugajinejom.pdf
    • https://cdn-cms.f-static.net/uploads/4390350/normal_60499c053743a.pdf
    • https://cdn-cms.f-static.net/uploads/4444647/normal_60278cc597668.pdf
    • https://static.s123-cdn-static.com/uploads/4405190/normal_5ff676dd267a0.pdf
    • https://cdn.sqhk.co/dabebasavus/hdgiwnp/38267614612.pdf
    • https://cdn.sqhk.co/xusarukave/9Kgghjc/roller_ball_massager.pdf
    • https://static.s123-cdn-static.com/uploads/4487423/normal_5ffbd4782082d.pdf
    • https://cdn.sqhk.co/xevowuto/fFuHibZ/wordscapes_level_10407.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vovuzize/crochet_patterns_for_summer_chemo_hats.pdf
    • https://s3.amazonaws.com/geradi/usa_volleyball_second_referee_quiz_answers.pdf
    • http://gegilifopom.myartsonline.com/project_on_astronomical_telescope_for_class_12th.pdf
    • https://s3.amazonaws.com/salosibejodod/39285689473.pdf
    • https://s3.amazonaws.com/varoximu/guluke.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010177.bin
dfeeae5feea6c4d1deddfad76954aa538704476b331b76338a136f65183cad9b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10177 2104 bytes
font_01_sfnt_off00010b3b.bin
e66de8dbb24872c24970385be8e638f901a8b826279f586b90bc599c8446b4ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3B 5460 bytes
font_02_sfnt_off00011dd9.bin
69d9211f5fe1a213045c3c0b1fdf44ca856b1181dc5c578072352fb1569b5ae1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD9 11116 bytes