Malicious PDF — malware analysis report

Static analysis result for SHA-256 313604170e0e9fb0…

MALICIOUS

PDF

75.6 KB Created: 2021-04-07 05:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 02c8903ad05b504c61039bc914ae3eac SHA-1: e040604d695a96d8856dd47705ba4ae97b98c67a SHA-256: 313604170e0e9fb0dd4470b69fb385d1b7011d21791a7829fc010c630f61a5a4
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://pelibifir.ru/123?utm_term=asphalt+xtreme+mod+revdl PDF link annotation
    • https://cdn.sqhk.co/suwapipejob/gTigMHn/16410911068.pdfIn PDF document text
    • https://cdn.sqhk.co/zizaratijiga/jhOYhau/97640425190.pdfIn PDF document text
    • https://cdn.sqhk.co/fofotixoz/BhageTi/55073363547.pdfIn PDF document text
    • https://cdn.sqhk.co/xubupigegi/i0hjXTx/depilofobomalegen.pdfIn PDF document text
    • http://pasiworuwiwoz.getenjoyment.net/wowipegob.pdfIn PDF document text
    • https://cdn.sqhk.co/resozasevej/hjhbFha/final_fantasy_7_remake_soundtrack_spotify.pdfIn PDF document text
    • https://cdn.sqhk.co/soxobiwefili/QahiijN/mcgraw_hill_connect_auditing_quiz_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/gafisasiwu/aVhiEhK/z_nation_season_1_episode_6_recap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c908e4ac-7d4a-453d-97b7-8da60b1a18e0/sotuvukuragolexasakogo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8253fdf-ead7-476b-a875-830558a8d19d/pelofopixamozoxabu.pdfIn PDF document text
    • https://5457524e-bace-410a-9ce7-c8d8bc0eedea.filesusr.com/ugd/f0ffd0_a1f1eafd45444f399b9ee1a41ac7063d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cb5a841-8600-4985-989c-0fa3d56a44fd/introductory_mathematical_economics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52d0db3a-9077-4e6c-a8fb-1bd2cebd87cc/64976530294.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/accident_incident_report_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fc49a00-551a-488a-bec3-bf637e573c08/diary_of_an_oxygen_thief_book_2.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/5x7_greeting_card_template_illustrator.pdfIn PDF document text
    • http://japinoxizidunub.myartsonline.com/73105371726.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/nojudixobezif.pdfIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_d6c8d206815e4ec9b79a1f6245696753.pdf?index=trueIn 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_off0000e801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE801 5316 bytes
SHA-256: 0b3b7301f7fd4e23e1c6a65272236f99a3d1ea942c6f0a0600fd9d787100b3b0
font_01_sfnt_off0000f9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F3 10968 bytes
SHA-256: 06add1c560b0448c9babdc7775ce02a8d30727ac29e392f69edfc9e3b1b0d768