Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc11d1ddae34cad9…

MALICIOUS

PDF

79.9 KB Created: 2021-04-11 09:10:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3073e3ea21c19ebd9f658575bf1eade1 SHA-1: 2ebb24306868889d9991c57e46e0a644fcba6279 SHA-256: dc11d1ddae34cad998b34311f91f8cd65cf875bcb3f8159b7cd477e1b9ba637e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs are the primary indicators of compromise, pointing to potentially malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/strik?utm_term=project+management+excel+gantt+chart+template
    • https://cdn.sqhk.co/gawagunikuw/4cxifbG/economist_subscription_cheapest.pdf
    • https://cdn.sqhk.co/kitatoze/XzPO8jg/tipamimure.pdf
    • https://rirujidina.weebly.com/uploads/1/3/5/9/135957349/a0f0fd.pdf
    • http://toportt.online/18540580640td1ia.pdf
    • https://cdn.sqhk.co/damapegapi/fhghcIy/nibenopuregoris.pdf
    • https://pigulanofalo.weebly.com/uploads/1/3/1/4/131406379/jatoxopebawig-kafux-wenanelogezoxi-kezilizitiminis.pdf
    • https://zevuvizaxetu.weebly.com/uploads/1/3/4/8/134887967/kaxenibejibes.pdf
    • https://static.s123-cdn-static.com/uploads/4407087/normal_600829e5cb980.pdf
    • http://xadexawufomovi.sportsontheweb.net/babetimup.pdf
    • https://cdn.sqhk.co/mirofifuba/9iegihf/cheap_online_shopping_uk_food.pdf
    • https://cdn.sqhk.co/dajeluparoso/fhbjcgi/digetuwi.pdf
    • http://xubanapirobula.mypressonline.com/wesiwozusije.pdf
    • http://help-feedback-amzn3.xyz/first_strike_valorant_na_qualifiers7em1t.pdf
    • https://pebezudaxefen.weebly.com/uploads/1/3/4/3/134347708/86d92d2bbfb3.pdf
    • https://cdn-cms.f-static.net/uploads/4427079/normal_605678d7418e3.pdf
    • https://talaxosukizarom.weebly.com/uploads/1/3/0/7/130775084/259d53bb752a1.pdf
    • https://vinosubolab.weebly.com/uploads/1/3/5/3/135316207/6742788.pdf
    • https://vujewixijul.weebly.com/uploads/1/3/1/4/131437312/mugelelefuvi.pdf
    • http://olx-delivery.cc/vertical_and_horizontal_analysisxf1xt.pdf
    • http://wei-nmvc.com/151121876122vatm.pdf
    • https://cdn-cms.f-static.net/uploads/4370267/normal_605f870a2b9a3.pdf
    • http://gatofupimekow.mywebcommunity.org/ccna_study_guide_2017.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pidodexogejax.myartsonline.com/walutozitotabanibodatuw.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb2b.bin
c0b09ea69e9264ad37f281898a8b8a3733075259c2704d201115334ae132f1ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2B 5316 bytes
font_01_sfnt_off00010d19.bin
09bfb72dc60f351cea22d7da4aaeeb0be51e4603b0602c14414262a3099be0bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D19 10908 bytes

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