Malicious PDF — malware analysis report

Static analysis result for SHA-256 da3b246f18697eec…

MALICIOUS

PDF

66.0 KB Created: 2020-11-11 23:41:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 7c63641776bcf27b217e113ea77508b0 SHA-1: 1ef4434586291441d2020c0dd942cc3f3b9ab7b8 SHA-256: da3b246f18697eecfdbaaceaf38f889a5cc871912ab4fbf29ceb675fe4bdd152
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains a large number of external URIs, with one notable example being `https://trafficel.ru/123?utm_term=rick+and+morty+mortynight+run+dailymotion`. The presence of numerous links suggests an attempt to manipulate search engine rankings or direct users to potentially malicious content. No scripts were extracted from this sample.

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/123?utm_term=rick+and+morty+mortynight+run+dailymotion PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369643/normal_5f919e888c872.pdfIn PDF document text
    • https://zisokilusativ.weebly.com/uploads/1/3/2/3/132303079/1322800.pdfIn PDF document text
    • https://vadurijale.weebly.com/uploads/1/3/4/5/134590900/zemorokawozaf_fibadamovu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408483/normal_5f975f8e3d3fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375209/normal_5f89e6bbbc3e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410989/normal_5f98ec713f966.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393369/normal_5f9fd4c19d16d.pdfIn PDF document text
    • https://kokejegifuro.weebly.com/uploads/1/3/4/4/134477846/gegebefaba-pagoz-peviwe.pdfIn PDF document text
    • https://vagomonezupu.weebly.com/uploads/1/3/4/4/134403629/443106.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372087/normal_5f8d9dfedcd72.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/kavugusepe/3988751986.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/valley_forge_towers_king_of_prussia_pa.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/nanuvaxuninag.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/map_testing_criticism.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd9a588b-ec7e-4898-a038-221e5f7c03f3/87892639330.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/large_bridge_score_sheets_printable.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_off0000c4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F8 5348 bytes
SHA-256: 4f236ff9e8cfc14c1c5c654e20f278b6d2ec230fab3d6cdd00df0fd8ee31737a
font_01_sfnt_off0000d70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70F 10380 bytes
SHA-256: a207f63d74feca7851731ecb45e1073fe1fe8718c937ebe04a4993dc41b90e1b

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