Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a79a05c879ba0cf…

MALICIOUS

PDF

72.6 KB Created: 2020-12-30 05:09:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 32aeb90aba23dcd184f06adfd7755908 SHA-1: 0a5cf09b0cb562cf38d1dfb87249b12cd890511b SHA-256: 1a79a05c879ba0cf3f7543bce876e5664f5f37e906ce7846c7d1227a6a0752e2
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a link farm, indicating an attempt to host numerous external links. One of these links, 'https://trafficel.ru/123?utm_term=pro+keto+rx+and+apple+cider+vinegar', is flagged as unknown reputation and is likely part of the malicious infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

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=pro+keto+rx+and+apple+cider+vinegar PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417817/normal_5fcafd84890a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368950/normal_5f9d36ea7adaa.pdfIn PDF document text
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/vimimijidife.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/kufazete/homogeneous_catalysis_mechanism.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/vazelapalipuzamepulib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12de4bf7-0b06-42ce-8b59-8b2e1a243959/social_security_office_albany_or_hours.pdfIn PDF document text
    • https://s3.amazonaws.com/lemefofutomapox/vefaro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c6f5f4a-bc63-4c13-be6f-b6b71c44cd6a/sutokidajuduga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc1f07a3-dbe3-4c37-a64f-d08646951739/balenciaga_triple_s_red_outfit.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/birikexizesivuk.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/psx_emulator_1._13_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/wakisaridowisepakarowow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5650382-6d42-4240-8b38-576ba35f3aae/56383564690.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94d5228a-d618-4fe2-82ce-e7a720fa49aa/5487148516.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7306d176-29f1-4a31-9529-70e30dbbd8a7/pathfinder_empyreal_lord_traits.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65871b5e-7a70-4e1f-81ec-f6e3c92fbeae/turning_stone_bingo_prices.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_off0000dcf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF5 5256 bytes
SHA-256: 52d241251241875c03d50d6f5f445d0d0225752aad51a938c104dbec861af6c7
font_01_sfnt_off0000eef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF4 11204 bytes
SHA-256: 3aff92186fa9ef96b051cf00ab17591070655e82beb2c237c9310fae7f1a2144

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