Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aeb6be54d95e9a7…

MALICIOUS

PDF

67.1 KB Created: 2020-11-25 09:18:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 5c9f06fa8d6b3584f795fccb7a885e04 SHA-1: 1e6386f3736536a0a5fead11778c1fb57291b836 SHA-256: 4aeb6be54d95e9a7f831aff209fc6b457dc882f301b375064f6500d4802dad7e
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. The embedded URL 'https://trafficel.ru/123?utm_term=reading+plus+app+for+android' and the first link in the farm 'https://pibogexo.weebly.com/uploads/1/3/4/6/134649935/e9fd87739f788.pdf' are suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=reading+plus+app+for+android PDF link annotation
    • https://pibogexo.weebly.com/uploads/1/3/4/6/134649935/e9fd87739f788.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475720/normal_5faddaaf9307d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420592/normal_5fbc7cbd02469.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/5defa0c3-e46f-4156-aa8b-299548f0a38d/vojafik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5e46269-0927-4c71-a6b7-79e28c1a5cc8/fewox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54087854-6a5e-4907-8b91-889370dcda06/16293550698.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/54540744583.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad893935-fc68-48ce-b48b-e46c11561b7f/counting_atoms_activity.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/anbe_sivam_movie_tamilrockers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09d7d926-dcbd-494d-b0d6-d8130460bb24/mewowovenubu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ba5a491-50e0-47a5-9a55-47304304e7e2/zotemigape.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_off0000ca9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9D 5216 bytes
SHA-256: 276ab9a13f244d33387c22a28c8674c99489ad11a443bd6a97826a5d884bf820
font_01_sfnt_off0000dc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC78 10364 bytes
SHA-256: ecc42e21968e5ea80a4e903c733675d03a9735dca03141c246f90d1860289293

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