Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd27a2ecc022b08b…

MALICIOUS

PDF

73.1 KB Created: 2021-04-03 04:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 3d12c4f17db26c3109601740bd62fb32 SHA-1: 1b879801c9607188bfe6c29539528c1c7f21e502 SHA-256: cd27a2ecc022b08b99071bab1692b6bec3b4392f1049faf38627d55b9839a1ee
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, indicating a link farm designed to redirect users to potentially harmful sites. The document body, though heavily obfuscated, suggests a technical query which might be used as a pretext for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/strik?utm_term=how+do+you+calculate+3+phase+current+of+a+transformer PDF link annotation
    • http://creditscoreusa.info/best_weight_loss_tracker_app13o50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472774/normal_60663dbb7a50d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462688/normal_6038d0df8da50.pdfIn PDF document text
    • http://mixezitubut.mygamesonline.org/is_a_new_harry_potter_book_coming_out.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392210/normal_6024c507783ff.pdfIn PDF document text
    • http://vorecan.fun/stock_market_closing_time_day_after_thanksgivingequfz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381294/normal_5fc8097800be9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390074/normal_601a25a2a3117.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365635/normal_5fcf5e1344dfc.pdfIn PDF document text
    • https://cdn.sqhk.co/vedimofaw/1gWKLgc/48096256579.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/qwKpjgU/46319332319.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452839/normal_604ab71899d5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444102/normal_604742aac9367.pdfIn PDF document text
    • http://graatorama.space/how_to_reset_an_armitron_watch_wr165nte6l.pdfIn PDF document text
    • http://yachts-4-sale.com/sujolezuv0zovo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/ralugenor.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/how_to_turn_on_bose_cinemate_15_without_remote.pdfIn PDF document text
    • http://moxosutemow.onlinewebshop.net/cambridge_checkpoint_mathematics_practice_book_8.pdfIn PDF document text
    • http://nibopinalilabaj.onlinewebshop.net/suledilasesisera.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/soselozofinexizu.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_off0000dcaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAA 5712 bytes
SHA-256: f64627bb3aac4fad001f3eb33ad749b4ec224e38de760134bcaed18820a99b4c
font_01_sfnt_off0000f00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00B 11272 bytes
SHA-256: b751cac6e55cc3b81369de044890f3ddb20bd8dd79ab4f2f01b26e4245389aaa

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