Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a07819c94f42880…

MALICIOUS

PDF

71.0 KB Created: 2020-11-18 15:58:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f71782db9ea1268220a0f5ca0d3226b SHA-1: d3440cb5c7fac109a53bd3ae8a8b8fc02e24cedf SHA-256: 2a07819c94f428802d32b6fbbe72c6ecb990586d52d31118d519d771e5879d5d
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_SEO_LINK_FARM, indicating it's part of a link farm designed to generate traffic. It also embeds a URL that leads to a potentially malicious domain, disguised with a seemingly benign title. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffnew.ru/123?utm_term=multiplication+charts+to+30
    • https://rozinefowo.weebly.com/uploads/1/3/4/5/134576391/refug_kogumafu_zegerakob.pdf
    • https://rowurasivove.weebly.com/uploads/1/3/4/3/134357219/soxizilalaxotimika.pdf
    • https://cdn-cms.f-static.net/uploads/4380525/normal_5f928e91c0d44.pdf
    • https://cdn-cms.f-static.net/uploads/4366993/normal_5f879eb04eb0e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/0841494a-4107-4f32-a000-1f6338546be5/mituzimisewizuzodogopexo.pdf
    • https://uploads.strikinglycdn.com/files/329efa52-1f03-43e4-9f45-b08a566395a5/nitetofojizirate.pdf
    • https://uploads.strikinglycdn.com/files/0ef8d6e0-a0e1-4284-a201-712dcca37008/mapumotibuzedomoz.pdf
    • https://uploads.strikinglycdn.com/files/196a35dc-d375-43eb-9c06-1f6319e975cb/69634834493.pdf
    • https://uploads.strikinglycdn.com/files/96a82c0b-1df0-49c6-bac3-5b69940a587e/31744250131.pdf
    • https://uploads.strikinglycdn.com/files/f86c681c-77d2-45f5-9a2f-1d91a5d5fa4f/gexuwaviwanafu.pdf
    • https://uploads.strikinglycdn.com/files/364ae389-8bcf-4f15-959f-cbd167b6f33a/usher_mp3_mix_download.pdf
    • https://uploads.strikinglycdn.com/files/69b98e54-08f2-4e0b-8860-094f70c53653/15867055936.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc98.bin
161aae11c1b4b400dedd31bd963f7b5a03770c2d842f5eda5669bb906c78669a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC98 5096 bytes
font_01_sfnt_off0000ddd0.bin
b9ffb5e36ebc81e091146b7ac0f55c1f43a779069e623c6b9fa0730bef39b92b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD0 10280 bytes
font_02_sfnt_off00010107.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x10107 4324 bytes