Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fb1bf817dd527d8…

MALICIOUS

PDF

67.2 KB Created: 2020-11-11 21:30:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 63b36c567cf6e6a0b59990c81fbe287e SHA-1: 4a760aac95774285b74d1c2ed3a47364057b3dbf SHA-256: 5fb1bf817dd527d870b867c101853c993aff8f7ed7c8961b7d3fe709f372d356
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a redirector link to malicious infrastructure at 'traffmen.ru'. Another critical heuristic flags it as a PDF SEO link farm, with 18 PDF links embedded, suggesting an attempt to drive traffic to various sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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.
  • 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://traffmen.ru/strik?utm_term=data+structures+and+abstractions+with+java In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367004/normal_5f8a16cf4b932.pdfIn PDF document text
    • https://tetobalowuw.weebly.com/uploads/1/3/4/5/134523757/8214817.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/fadedosi/world_s_easiest_game_cat_queasy_cat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4379758d-2d17-4b50-945f-6ca85926c5c8/penopikineguredu.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/raganumi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c59fdd87-f05b-4674-8f17-aeceda28f1c7/silent_night_song_on_piano.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/rudobivabatikap.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/i_got_sunshine_on_a_cloudy_day_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/alternatives_to_animal_testing.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_off0000c689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC689 5364 bytes
SHA-256: 4783864d95af91bf7492f0ed17697cfaf69f13a4c8fe2aa31cdcb5f540c3c4a6
font_01_sfnt_off0000d8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DA 11508 bytes
SHA-256: 3dd0a62eddc0707dd63e9714ea7376ab40fd1940a0acdc8fb10b254ca76c7a0b

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