Malicious PDF — malware analysis report

Static analysis result for SHA-256 245f8cf9bc6762ce…

MALICIOUS

PDF

79.0 KB Created: 2020-11-13 02:05:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f3a3cdf6254dd450030263d34e85422 SHA-1: 91dc9580e2d641f1be030733a99c53d5481ca2ba SHA-256: 245f8cf9bc6762cebff0d60cc96f31fc86bd57ecbc27dd92e55ba3604414df06
164 Risk Score

Malware Insights

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

The PDF file is flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a large number of external links, including a link farm, suggests a phishing or SEO manipulation scheme. While no scripts were directly extracted, the PDF structure and heuristic firings point towards a malicious document, potentially using embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/strik?utm_term=french+bulldog+new+orleans
    • https://kiwemedorupa.weebly.com/uploads/1/3/4/4/134446537/rukolebavewavetem.pdf
    • https://wovuxekas.weebly.com/uploads/1/3/4/3/134379471/kaxuvitogiko.pdf
    • https://cdn-cms.f-static.net/uploads/4476577/normal_5fa5bf2888b34.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/tenunud/mu_origin_2_apk.pdf
    • https://s3.amazonaws.com/felijaziremole/holes_questions_and_answers.pdf
    • https://uploads.strikinglycdn.com/files/a591bc53-77bb-4bad-bc05-e6cdd90a22d3/measurement_activities_for_4th_grade.pdf
    • https://uploads.strikinglycdn.com/files/02a8a4be-f37e-480c-8201-78a6df496946/cursors.io_hack_2017.pdf
    • https://uploads.strikinglycdn.com/files/af185fef-ea6e-41c5-9afb-787744856b3e/bizexolipadefotogubudosa.pdf
    • https://uploads.strikinglycdn.com/files/28a6abc5-b927-46f3-94d3-434b0e690f7d/dotikotoduja.pdf
    • https://uploads.strikinglycdn.com/files/d2dbb03a-64d2-4a66-88d9-6234b9afd24c/26989174472.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea04.bin
4fb5d48d97d379c11999e2b6ff2a8175c7dc7eb56399cbf617931bc38a24b882		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA04 5140 bytes
font_01_sfnt_off0000fb6f.bin
3fcb7af43db2ed00c313ea11ee2785a42811711125b61506036bfacdc01cfc16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6F 11492 bytes
font_02_sfnt_off0001216a.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1216A 4324 bytes

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