Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a552507c3ffc267…

MALICIOUS

PDF

77.3 KB Created: 2021-03-25 01:30:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: feeab856beff06f7d73cbfced13217cd SHA-1: 29273b510f3d88bc2108c8823d577306768fa7a2 SHA-256: 0a552507c3ffc2678c542f99a74f644eaf9ac59473e2d62e1d3b384bd0b3cfa5
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to contain search-related terms, suggesting a lure to disguise the malicious links.

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://xajibur.ru/strik?utm_term=asus+m4a89gtd+pro%252Fusb3+compatible+processors PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470228/normal_6039acc14b59a.pdfIn PDF document text
    • http://zakosemej.mypressonline.com/tiwawomepesodobamodemupe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467032/normal_6015e1083ccde.pdfIn PDF document text
    • http://waparudadip.mywebcommunity.org/6806516916.pdfIn PDF document text
    • http://nabavawuzafurur.mygamesonline.org/16244466628.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414153/normal_600e366eeeb4b.pdfIn PDF document text
    • http://pedagodogiko.getenjoyment.net/danby_window_air_conditioner_-_6000_btu_-_white.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465024/normal_602b731b22f4c.pdfIn PDF document text
    • http://niwizonoleror.mywebcommunity.org/citizen_eco_drive_calibre_8700_manual_set_date.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479454/normal_5ffccb1b9f3e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483089/normal_6048df0144cc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485711/normal_5fe9e7c473210.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451353/normal_6031f97daaa6e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ketabigumowun.atwebpages.com/best_app_to_learn_hindi_from_telugu.pdfIn PDF document text
    • http://litorow.myartsonline.com/meeting_attendance_sheet_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c292cdb-37bb-4201-a956-ccc6a18e5a65/39044584181.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83e7e895-5f9d-43e7-805a-a614f944a7c7/the_secret_life_of_the_american_teenager_episode_22.pdfIn PDF document text
    • http://tupesom.atwebpages.com/zeruxema.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48a5041d-1921-4810-8075-c26197eb4c35/viktor_frankl_mans_search_for_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df229407-b4dc-42be-9045-bbefc002bbda/vupibezafiwewefepan.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_off0000eb84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB84 6160 bytes
SHA-256: 6717a1d9961e098db905ee5b3458fce859d9ba4867b736b4043d7cbc8b0c688c
font_01_sfnt_off00010063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10063 11588 bytes
SHA-256: e7b4abd40aa79664d9f2daa4ca35357477e6c6f7fdf5cad3d0bb480e1000372e

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