Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b4bb72669209fa…

MALICIOUS

PDF

84.0 KB Created: 2021-05-06 18:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ddd6a4a206db7ad4842a6013bda09d73 SHA-1: 7d2da6098e357c54afa63c1dddd5edf8e12e2de4 SHA-256: 16b4bb72669209faf031f5b3f93fb0082ae7285f10d6a98df2c63a779fa932b0
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards a phishing attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/strik?utm_term=the+green+mile+quotes+i%2527m+tired+boss PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4482191/normal_60684328badc4.pdfIn PDF document text
    • https://fimulumalopa.weebly.com/uploads/1/3/5/3/135326017/lejefivefovabef.pdfIn PDF document text
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/dipikiwesapuzobulew.pdfIn PDF document text
    • http://topshops.website/500133968209om23.pdfIn PDF document text
    • http://twoup-viktoria.online/solve_by_elimination_method_worksheet10yy8.pdfIn PDF document text
    • http://tewapakug.22web.org/furixedagawimukebuge.pdfIn PDF document text
    • http://tasiperop.medianewsonline.com/aqeedah_tahawiyyah_arabic.pdfIn PDF document text
    • http://idealica-columbia.site/brotherly_love_stories_in_the_bibleabgrs.pdfIn PDF document text
    • https://tebumozokafu.weebly.com/uploads/1/3/4/4/134471783/bivabelati.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478438/normal_601433e744e22.pdfIn PDF document text
    • https://vulelarebu.weebly.com/uploads/1/3/4/9/134900748/303751.pdfIn PDF document text
    • https://pegepigav.weebly.com/uploads/1/3/4/4/134481067/71246.pdfIn PDF document text
    • http://tetupamino.mywebcommunity.org/ruwoxidiwamotoruj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500667/normal_6056f1cd9ea7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475382/normal_6064247326b88.pdfIn PDF document text
    • http://jelonit.22web.org/kilofo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415767/normal_5fd992279e0a4.pdfIn PDF document text
    • http://dkblogin-de.com/tamil_magazine_ebook_free_downloadyykkr.pdfIn PDF document text
    • https://xeropupofusopa.weebly.com/uploads/1/3/0/7/130776394/delof_xugoxal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vebagakid.onlinewebshop.net/what_does_break_night_mean_in_golf.pdfIn PDF document text
    • http://nijunopuk.rf.gd/aurora_hdr_2018_mac.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_off000107f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F6 5280 bytes
SHA-256: 23111ced1c28c0997d089ffb52679d794030a9a73667e1d3633056564a0030d6
font_01_sfnt_off000119bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BC 11528 bytes
SHA-256: f0229a71ffb90b12276bd94e477b84cfdc57c4c24a0b4fb6d54fadf0f535c738

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