Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c91caee097058a8…

MALICIOUS

PDF

70.6 KB Created: 2020-11-14 04:06:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 7cf971b148431a557e87900a8bb824cb SHA-1: 79c8b9780ee779d4f3639745f03c52f1189cbdcf SHA-256: 8c91caee097058a802f4ba662bf04579b5c16590ea683eb33b2981b198e8f15c
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many of which point to potentially malicious or phishing sites, suggesting a link farm or distribution mechanism. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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/aws?utm_term=ireport+tool+tutorial PDF link annotation
    • https://gegakavawedo.weebly.com/uploads/1/3/4/2/134265750/5320126.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457849/normal_5fae9997af502.pdfIn PDF document text
    • https://moguvikob.weebly.com/uploads/1/3/0/8/130874292/588d000a5.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/wudawuwifigogebala.pdfIn PDF document text
    • https://liloxowilobo.weebly.com/uploads/1/3/4/2/134265539/57880.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/940ebb9a-76f5-4077-96fe-ce15712f834d/delphi_database_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d45ca1b-5021-4e7e-9efe-cb52c12deb4a/rafagudojopiduwuvakuzin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58860e88-204d-4709-9c10-b2815730b9e6/vuposipakatugav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3a28ec9-9bbd-48ad-a65a-d5fdfacf2480/96484080541.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05c4c0b2-86c7-4186-9f7d-34842e8c57ac/bulaf.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B4 4348 bytes
SHA-256: f877749d38ce695f58d8516adeecb562241ef3a30954183e1b1d36551617fb1a
font_01_sfnt_off0000d779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD779 12320 bytes
SHA-256: 1f960fe1b67f8695142970a697f94fcecb22ff5f7d529814e1919e0f47f7867a
font_02_sfnt_off0001003b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003B 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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