Malicious PDF — malware analysis report

Static analysis result for SHA-256 02497a45d8297723…

MALICIOUS

PDF

71.5 KB Created: 2021-01-04 23:00:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: edda1eacda5a21f5d659d8a605a29ba2 SHA-1: 9207e657e72043cd810d09b8621e8d28e284e592 SHA-256: 02497a45d8297723f095cbc8b142518997ba32ba5bfbb4a369dc4f7e4c62fed1
156 Risk Score

Malware Insights

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

The PDF file, disguised as a worksheet answer key, contains numerous embedded external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The presence of a large number of PDF links and the ML classifier flagging it as malicious strongly suggest a phishing or malware distribution attempt. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious intent to redirect users.

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://traffset.ru/123?utm_term=geometry+5.8+worksheet+answer+key PDF link annotation
    • https://puxokobipo.weebly.com/uploads/1/3/4/5/134524361/16e64c8bc78.pdfIn PDF document text
    • https://wafulerafi.weebly.com/uploads/1/3/4/5/134503758/xugawosifo.pdfIn PDF document text
    • https://tonudekosinin.weebly.com/uploads/1/3/4/6/134685286/91330eaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411931/normal_5fd974a9b14d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403418/normal_5faafc2602e5f.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/fezenur/printable_adding_worksheets_for_first_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a4f4e19-331c-40ec-a52d-867deb696bb3/67100527069.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3e4d7e1-3785-4482-9b12-0bfde982fa35/32032402866.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2298ad4b-5e85-4fe8-ba8b-5fb18e8ced6c/final_fantasy_xv_cheat_engine_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/ziwikitonotimorefudesenoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fd00d37-f3c4-423e-8c78-c224874eab52/xareron.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/friends_tv_show_episode_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d59420cc-7ff2-48d8-9223-fab0d573b93a/color_chart_for_painting_house.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_off0000da4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4F 5532 bytes
SHA-256: b7dc662f0e105cc8cee50f61eb11b2003dee33aac83a68ff8fda9ef1c195ed26
font_01_sfnt_off0000ed17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED17 10620 bytes
SHA-256: 2f8485c9235889a642ca5ac8e8000fe8e780856e57d36f3a7a3a842cdde8558f

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