Malicious PDF — malware analysis report

Static analysis result for SHA-256 72b08f876cd7f6a2…

MALICIOUS

PDF

70.2 KB Created: 2021-01-01 18:55:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 9d17ca502d3bf35c0b6f82a3a41968d4 SHA-1: 7f19ec56e42886e6a721c51c102979bca078d78a SHA-256: 72b08f876cd7f6a25c9ebea5ed5b2da6814844f5546e4c0d07131b991343783e
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, with critical heuristics identifying it as a redirector link and a link farm. The primary malicious URL, 'https://ggtraff.ru/strik?utm_term=linear+equations+calculator+3+variables', is flagged as a redirector. Another significant URL, 'https://xamodeximafu.weebly.com/uploads/1/3/2/6/132681508/fejikazavosema.pdf', is part of a link farm. The document body, though heavily obfuscated, contains references to 'Linear equations calculator 3 variables', suggesting a lure to disguise the malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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=linear+equations+calculator+3+variables In PDF document text
    • https://xamodeximafu.weebly.com/uploads/1/3/2/6/132681508/fejikazavosema.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376875/normal_5f8eccaa6b501.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/8227d265-56a9-48cd-a47f-2221d56a34f9/26485517348.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46aa4cc6-7600-47c8-89ae-a4290e2b9681/pibuzisubileweseduwigiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38d3cb8a-07b0-4246-a105-708e05cd749a/kaxoga.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/couples_therapy_communication_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e242b664-32ea-4150-ba61-4cd97f9916b9/pokemon_insurgence_cheats_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/625454a0-3680-4590-88c8-5c97e1e961cc/summer_glau_porn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a67389fb-1f19-4b8d-b7ff-7368fe464387/lefivemakok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50b24a23-8b3d-4e7e-9a02-6d8d8e84d6cc/80026693690.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/118b1609-5e91-4ed3-ba67-bb37ff34f5af/zoresowefiwelagi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3ebfbed-fa3d-4270-a38e-f6d60e3fba7d/530824399.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_off0000d78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78F 5224 bytes
SHA-256: 721bf73b13c5e595e37e217f7c5ab83a10842251f386f66bf790d2c12b545836
font_01_sfnt_off0000e973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE973 10256 bytes
SHA-256: 97c65e7f507fb618dc221fffdbf41c5da69728fe7a9e8fe8aa263e80f9870767

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