Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7e8c2f28feb7c62…

MALICIOUS

PDF

86.0 KB Created: 2021-02-27 20:53:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 412c980443d3df5824bba1d291a6262a SHA-1: 0ee24754fbc741a02f4c18d3b7ca6b452d7917ce SHA-256: e7e8c2f28feb7c62d2dc5ab604780017e246233b2f1fb66723906f5db501df7b
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting services, indicating a link farm designed to distribute malicious content or phish for information. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/strik?utm_term=how+to+write+a+discussion+in+a+biology+lab+report PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484997/normal_601998436fe1a.pdfIn PDF document text
    • https://cdn.sqhk.co/sunaxidida/AhbDZjd/wokosobapukisikat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489734/normal_5ff3394b06b23.pdfIn PDF document text
    • https://xulazipilo.weebly.com/uploads/1/3/5/9/135958699/rovavopur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445736/normal_603a1a0eb010f.pdfIn PDF document text
    • http://dodemul.mygamesonline.org/lawixagigubojajabi.pdfIn PDF document text
    • https://cdn.sqhk.co/pesamelez/OibgeGd/39263018338.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugewameru/iFA9GIG/ring_a_bell_idiomatic_expression_meaning.pdfIn PDF document text
    • https://tozisodije.weebly.com/uploads/1/3/4/4/134486105/taxedefuxap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388824/normal_5feb0874bf2df.pdfIn PDF document text
    • https://cdn.sqhk.co/totimujid/5hffKje/45728095572.pdfIn PDF document text
    • https://zulasiromeg.weebly.com/uploads/1/3/1/4/131453934/5d8267667836f82.pdfIn PDF document text
    • https://cdn.sqhk.co/kopenanum/gdibL1N/20798125259.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495385/normal_5ffebc83adfa7.pdfIn PDF document text
    • http://zanovekolasin.mywebcommunity.org/guitar_songbook_for_pc_free_download.pdfIn PDF document text
    • https://rowegodidevonu.weebly.com/uploads/1/3/4/4/134468430/zatufagud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462775/normal_5fd0fddb197af.pdfIn PDF document text
    • https://kotedeturu.weebly.com/uploads/1/3/1/6/131606402/vijixon-tuxijipovabixal-zuxavajowagidol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xekabotiwuker.atwebpages.com/losulabivubawajetukilobe.pdfIn PDF document text
    • http://xewewiwuxadul.rf.gd/android_box_game_controller_app.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_off00011277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11277 5536 bytes
SHA-256: 9386f97c4212977a04f3d03ac4bb0e2ee084b4b72783094de7d78afa46d49110
font_01_sfnt_off0001256a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256A 10772 bytes
SHA-256: 7de98197641d3a6c9065991fc521a33e2bd5b80a2585151b6ccef31df9044301