Malicious PDF — malware analysis report

Static analysis result for SHA-256 c607c4c8de665baa…

MALICIOUS

PDF

68.9 KB Created: 2020-11-14 06:19:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 104539e32fc53cbe48696b0a6dae5ab9 SHA-1: febbaba8ff89abd47de7cb132ea22e67d72075c0 SHA-256: c607c4c8de665baa41d79859f646eaccf86bf62dde2d33c655563b25f93890b7
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors, indicating a link farm designed to distribute malware or phish users. The heuristic firings strongly suggest malicious intent, with one critical rule identifying it as a redirector and another as a link farm. The ML classifier also flagged it with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/strik?utm_term=nonfiction+book+report+template+middle+school+pdf In PDF document text
    • https://menekagamop.weebly.com/uploads/1/3/4/0/134097565/539c35.pdfIn PDF document text
    • https://guvapokasek.weebly.com/uploads/1/3/4/4/134437462/fikowozas_tedavoriger_pobezopunus_konusosuwup.pdfIn PDF document text
    • https://rafuwufavirose.weebly.com/uploads/1/3/4/3/134334278/5436620.pdfIn PDF document text
    • https://kugodago.weebly.com/uploads/1/3/4/4/134491336/e8631.pdfIn PDF document text
    • https://junoxavod.weebly.com/uploads/1/3/1/3/131384771/53cee7c7f75c2.pdfIn PDF document text
    • https://fixumimudojuzu.weebly.com/uploads/1/3/4/6/134607797/sorojesuta-wavozaziwimona-nojuw-pisunabubezu.pdfIn PDF document text
    • https://rapexinet.weebly.com/uploads/1/3/4/3/134328854/7fe74dfa.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/dd8c3330-89a7-4704-9c5b-bff79f8dfdd5/canon_powershot_sx80_hs.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/vuvoxisibejeme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6880fccf-cf80-4d89-84af-c07f97bd8e19/kcet_schedule_today.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54211876-5e61-452f-ada9-d9e44d277bf0/thank_you_for_your_mentorship_letter.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/folaguwodebefakos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffcc2ec8-cf29-4015-ab0a-356f7e72e459/rocket_league_auf_englisch_stellen.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/13235280290.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e39309ea-ab63-4fe4-9cd1-c5b35bdeb94e/tajuminenomidenavagun.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_off0000cf02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF02 5568 bytes
SHA-256: df8f2d2432222a2c3dfc563c8cf0e603036351d615d308d20301065eb85572b9
font_01_sfnt_off0000e1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CE 10708 bytes
SHA-256: 4154bbe035e075c353dd7ded9f001abdbda61a8fc27820a8ffd1d3483367eaf4

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