Malicious PDF — malware analysis report

Static analysis result for SHA-256 9943c63e61306bb9…

MALICIOUS

PDF

65.4 KB Created: 2020-11-11 10:01:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 390f1d16c19880bf65e58e978969f079 SHA-1: df9205151f34c0d756f1d4f7e3a80db7aa432963 SHA-256: 9943c63e61306bb9293d7ba665fcbaf790c9eaa20f5a377561980dbbbc433b56
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external URIs points to 'https://trafficel.ru/strik?keyword=sarracino+middle+school+socorro+nm', which is likely part of a phishing or SEO manipulation scheme. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', further indicating malicious intent.

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://trafficel.ru/strik?keyword=sarracino+middle+school+socorro+nm PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402294/normal_5fa234a3b1b0a.pdfIn PDF document text
    • https://bikukanod.weebly.com/uploads/1/3/4/5/134583710/27eb27a9177.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392470/normal_5f91ce41d828e.pdfIn PDF document text
    • https://lotatodekimin.weebly.com/uploads/1/3/4/7/134705716/cfb141d4eeb16.pdfIn PDF document text
    • https://fevuxutub.weebly.com/uploads/1/3/4/1/134131759/bedegujesul-xijurolalamiti-zumejuveduxux-fexaku.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/gupuso/functions_of_morphology_in_linguistics.pdfIn PDF document text
    • https://s3.amazonaws.com/gonavo/40947225506.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/77004145008.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/free_pop_slots_game_download.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/nfl_collective_bargaining_agreement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/958ab8b2-34ce-4734-97a7-19f7c6f9a8a4/8604090187.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/77183757141.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_off0000c10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC10B 5284 bytes
SHA-256: 2ac2e5d06df119b4bcab666a002ed0045b0ddb486ac8e2731c07f933a1522d03
font_01_sfnt_off0000d2ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CE 11364 bytes
SHA-256: bac82606d01fd4401908f0a5de1d58a831a76e403ecdc3431c5b1656720f64f9

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