Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f9ad102356e3fe0…

MALICIOUS

PDF

59.2 KB Created: 2020-12-24 01:07:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9d1df18ce1b06aa79a204fb699e1634f SHA-1: a111738fdf0cb848a1218da8564f7765ba6ca0fd SHA-256: 8f9ad102356e3fe01ac7dd89c89fc81bde3ec4fd6ad49403d66859242dadca29
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one pointing to a suspicious domain ('trafftec.ru') that is likely part of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically related to phishing. No scripts were extracted, but the presence of many external links suggests an attempt to redirect the user to malicious content.

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://trafftec.ru/aws?utm_term=hodder+gcse+biology+textbook+answers PDF link annotation
    • https://rimususoku.weebly.com/uploads/1/3/4/5/134587725/8aa316f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383314/normal_5f969f621473b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414871/normal_5fdb3c04d5649.pdfIn PDF document text
    • https://cdn.sqhk.co/soxemudu/CAjfdgc/kasuvazataju.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/706257f8-d550-47ca-b27b-a5c2cacc4d3b/84767327115.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54aa2718-49a1-442a-8165-99a28f7a7d29/cube_method_for_strongman_2.0.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eba33445-b82d-421b-920a-bac9f9803e81/16241589934.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/sebimiwisijop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef565f53-7b68-45d8-9d00-1f2ddcd8fe40/46260021894.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ea09128-85ca-430a-934a-ca8d431c724c/book_of_shadows_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3f0414e-7cff-4091-b3cd-35549b3e18d5/gibson_music_hall.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c589e18-9efa-4740-a16c-568513df9ae3/19032799448.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_off0000ab40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB40 5536 bytes
SHA-256: 33117a0520c6acc311549879f3e6db68271e62e12c3c44f9056af376197310f1
font_01_sfnt_off0000be36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE36 9984 bytes
SHA-256: d0d87b68e20386894d74f13249e75d6b5cc0874823ea40eb83d7860d7223477c

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