Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e0b913091291da6…

MALICIOUS

PDF

79.1 KB Created: 2021-05-10 23:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0a1eb0a984ad86e199d75470d5e33adb SHA-1: 10d7ee93309d3ec4bade9f928d3c4f15504acde1 SHA-256: 6e0b913091291da6be6865a3646ea1c85d8e2940dbe1f293840fe44f9fb7b755
186 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, many pointing to disposable hosting services, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://nipisod.ru/strik?utm_term=praying+for+your+enemies+to+die PDF link annotation
    • https://cdn.sqhk.co/munuluxel/eJgfGhj/81483048484.pdfIn PDF document text
    • https://cdn.sqhk.co/duzoxibuf/idjf5jf/war_and_magic_ios_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/barugogip/bYhhwhd/derwent_lightfast_pencils_12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471475/normal_60225459b97b1.pdfIn PDF document text
    • http://sosyaltakipcipanelin.com/xagewafonowawokgd1re.pdfIn PDF document text
    • https://bemebedutor.weebly.com/uploads/1/3/4/6/134624352/belorep_fusemesokeru.pdfIn PDF document text
    • https://bevevigulamop.weebly.com/uploads/1/3/4/7/134759368/bapexew-vaxexuso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404133/normal_6004beef262fa.pdfIn PDF document text
    • https://dojinutek.weebly.com/uploads/1/3/4/1/134108596/sidekegodimir.pdfIn PDF document text
    • https://padilokemim.weebly.com/uploads/1/3/1/3/131381900/vilenelaperez.pdfIn PDF document text
    • https://legovizadedugid.weebly.com/uploads/1/3/1/8/131856283/numuvetav.pdfIn PDF document text
    • https://xemibunadagom.weebly.com/uploads/1/3/4/6/134639404/ramavuxufoditab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419452/normal_601e109f5b919.pdfIn PDF document text
    • http://winoorama.fun/greek_gods_yogurt_honey_vanilla_nutrition_factscu9zu.pdfIn PDF document text
    • https://cdn.sqhk.co/lukulobu/gcLSheI/73357717720.pdfIn PDF document text
    • http://profaudit32.ru/58841122390lfmqb.pdfIn PDF document text
    • https://siwufofewexiv.weebly.com/uploads/1/3/5/3/135329456/favagawujiriwe.pdfIn PDF document text
    • http://martakkord.ru/zavemisanmjw7.pdfIn PDF document text
    • https://cdn.sqhk.co/vilonunufuk/jgghfa0/pulse_secure_not_connecting_to_internet.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/pirofopafu/facebook_pixel_installation_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/6904675463.pdfIn PDF document text
    • https://s3.amazonaws.com/papuja/79605640527.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_off0000f8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C2 5300 bytes
SHA-256: e39405b5d5b3630c2966db34e7978f964389ae0d052fd93454ae52b969b76c39
font_01_sfnt_off00010ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC0 10724 bytes
SHA-256: 2cb9c08b5824a32f3ac227ae5ebb0871043a3c1c58a940494fa469b8069ee0d0