Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa61eedfc50991b0…

MALICIOUS

PDF

65.9 KB Created: 2020-11-24 02:25:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0803e9dd8e95b30be530c98a3f3a8305 SHA-1: 0c21c66f058a1179a9a4d0a36f10792601500b31 SHA-256: aa61eedfc50991b0eabff3bca18f5387a1b9eec39ed626c0524fba363a13e0d7
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=back+to+eden+book+by+jethro+kloss PDF link annotation
    • https://xodetawutal.weebly.com/uploads/1/3/0/7/130774968/388f73687f5e7de.pdfIn PDF document text
    • https://nexawukuvinu.weebly.com/uploads/1/3/4/5/134578226/b3e5c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366044/normal_5f8762f8443e5.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/80a0eb0a-d674-4a2d-8ff6-2c23703adb07/47867428845.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/aqa_a-_level_psychology_book_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e86602d-802c-42db-b0f3-52bd43162ab0/referonegiregosu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f5dd676-3574-4f61-bc00-742786b263fc/70233780462.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0def4a7-8c13-48e7-a18f-2156ee412514/53093488187.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af431be0-eca1-49df-a6d5-1b4a700c0713/6697420428.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee4eff68-2bd9-4dd3-8928-c18aea5fb0f2/27914424751.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_off0000c3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F3 5456 bytes
SHA-256: efeea81469068e0f58c66cc655fd99c6b0b7b000517a54fd92f6078d9c64b8a5
font_01_sfnt_off0000d684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD684 10580 bytes
SHA-256: 0ea59a9d9470ff64d0aa1d4758e878939a333cd9b4a9194feba33ed0bcd4d76b