Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb39895e858061f1…

MALICIOUS

PDF

73.3 KB Created: 2020-11-11 22:56:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91ceaa40a49bb533886883cf1a14c3ab SHA-1: 941590c2f7bc0b75195cb7ecdf4cf5b67117d059 SHA-256: eb39895e858061f1bb598731838fef4d6246b7b2fa61e6e8a8a9e2130a1d1f90
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on platforms like Weebly. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. While no scripts were directly extracted, the structure suggests it's designed to redirect users to potentially harmful content.

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://trafffe.ru/123?utm_term=adventures+of+god+cats
    • https://mivoxoxez.weebly.com/uploads/1/3/4/3/134340481/xusafomib-bafubabepevumo.pdf
    • https://xepebujusu.weebly.com/uploads/1/3/4/3/134319702/bejufiwubekugafis.pdf
    • https://jeretidaker.weebly.com/uploads/1/3/4/5/134595905/b47811c5a5e0a.pdf
    • https://cdn-cms.f-static.net/uploads/4366374/normal_5f9ae40142e6c.pdf
    • https://fiwugoxatalaj.weebly.com/uploads/1/3/4/4/134498599/fexexatiligo_wapibut.pdf
    • https://cdn-cms.f-static.net/uploads/4386094/normal_5f8dd5e747c48.pdf
    • https://xizotikozuza.weebly.com/uploads/1/3/4/5/134587863/kelabomuto_wapokob_vunelofidajubi_zejevaze.pdf
    • https://toxavepudu.weebly.com/uploads/1/3/4/6/134634724/wivamonofo.pdf
    • https://cdn-cms.f-static.net/uploads/4380230/normal_5f8e180969b09.pdf
    • https://depufavekozumel.weebly.com/uploads/1/3/4/0/134017714/9dcb34a5408a.pdf
    • https://cdn-cms.f-static.net/uploads/4366978/normal_5f900d3c94495.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bulolimepol/43954792237.pdf
    • https://uploads.strikinglycdn.com/files/997c0382-7545-4408-9627-9283bf33339b/31680133986.pdf
    • https://s3.amazonaws.com/voxazedisula/44207043145.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_off0000d645.bin
fd2e3381eae67f4c7fcebf164a8171a45157d0954041d1d900f2e75b0f5e8087
pdf-font-stream PDF embedded font (sfnt) at offset 0xD645 3016 bytes
font_01_sfnt_off0000e10d.bin
e24b344f351998cc8f246a09c9948ed9dc363a8f6f6aba1e63b27444f356965f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE10D 5208 bytes
font_02_sfnt_off0000f2df.bin
90a50b4f16762d21de5343dcb885f12d02b4339378bd0b129515f957ae6760b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DF 10824 bytes