Malicious PDF — malware analysis report

Static analysis result for SHA-256 5328904a8a7ed03f…

MALICIOUS

PDF

75.0 KB Created: 2020-11-23 02:52:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4e694e1f05c8e995a40ce7f03a099da9 SHA-1: 4e24d44a8a0306310878348411f1e19b78423ca7 SHA-256: 5328904a8a7ed03f9944ed49f5975c40c2af209908616b2e8839a9c6ebf7b486
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, a technique often used for SEO manipulation or to direct users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' specifically flags this behavior, indicating a large number of external PDF links. The ClamAV detection and ML classifier further support its malicious nature, suggesting it's a phishing or trojan distribution attempt.

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://trafffi.ru/aws?utm_term=ccna+exam+answers+chapter+7 PDF link annotation
    • https://nitetemefugek.weebly.com/uploads/1/3/4/7/134772401/kabigo.pdfIn PDF document text
    • https://firerokuk.weebly.com/uploads/1/3/1/1/131164187/880987.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366382/normal_5fb669fe89a09.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/pasawexawinogad/chirutha_movie_songs_naa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/326c4939-0caf-418d-88e4-90040faa6f5d/92708264576.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42ed7d4d-661c-4357-b882-58ea3f2e1066/blueprint_for_negro_writing_discussion_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf203dda-f386-4bc8-b8a5-549af9b4e48e/73010638211.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f7f56a3-9f48-4556-b86e-038c76a11775/28261328228.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da1dafc0-8841-4017-b92b-a65d6a3e1712/gitesazatojosiveder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6318d909-770e-462c-abf9-1e14f63b240e/51677649221.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/606ef280-5547-4e94-b519-4e4fe4221bbd/hp_envy_5530_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2a6b018-ac9b-4130-a20c-6cfa2ccac693/ketusol.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/78016083376.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_off0000e8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C4 5284 bytes
SHA-256: 53874182cf5fb275e19b2a3a12e86a243f92a6f83fcfb194f168636e8fbd972f
font_01_sfnt_off0000faaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAA 10736 bytes
SHA-256: 5c69fe0c48aab124ae38b8ec2b36b4b0202b480e0c25250cdd29e455a64b2bc0

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