Malicious PDF — malware analysis report

Static analysis result for SHA-256 bebf72db9a908fb2…

MALICIOUS

PDF

77.1 KB Created: 2021-05-28 15:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0796168ad4c01c24d686509bebb3ef99 SHA-1: de0227c960d4a046da78af35c1b44117a78f2bc6 SHA-256: bebf72db9a908fb2a62c186f8bfc14172054aeb95a539a8bffcce3dcb6dc772f
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting services, indicative of a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links. While no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to classify this as a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://soxebez.ru/strik?utm_term=what+is+the+main+idea+of+mending+wall PDF link annotation
    • https://vipoferizapil.weebly.com/uploads/1/3/5/3/135346342/lutalelajituw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373271/normal_603616ed238b2.pdfIn PDF document text
    • https://mowoxesabed.weebly.com/uploads/1/3/4/5/134594013/kamajun.pdfIn PDF document text
    • https://gubepukabo.weebly.com/uploads/1/3/0/8/130873841/ninejemimesi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366048/normal_605ef9b8a9a84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489598/normal_603a6b249e225.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465003/normal_605300476ac5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375708/normal_60158188beeed.pdfIn PDF document text
    • https://vorusasu.weebly.com/uploads/1/3/2/7/132740845/lejujizavez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451027/normal_60597ccbbefc4.pdfIn PDF document text
    • https://rapusixub.weebly.com/uploads/1/3/4/6/134631860/ada11739d373.pdfIn PDF document text
    • https://mewimazekik.weebly.com/uploads/1/3/4/0/134099221/tilufiwusapa.pdfIn PDF document text
    • https://pixijitawe.weebly.com/uploads/1/3/4/5/134593468/mazab-saxuzudij-lowedutoxodited.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424953/normal_5fe2a6abce869.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426260/normal_5fc8ba877fb33.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/94e15522-5761-4332-bc8a-34ccafb7a0aa/how_to_use_google_cardboard_app_without_button.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f895478-fb98-4ff7-ad3a-310bdda3086d/vobup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42e96ca9-f5b9-47ba-8cb2-c2a1f785fdbd/92714350686.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c692efa-741f-4b76-b0c3-e96bba19d145/jijurifa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43936992-4cdc-4571-a0b4-301378fbc117/nietzsche_schopenhauer_as_educator_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f221f4a5-fb38-4ef3-a377-3568166ef8b7/how_to_use_emotion_wheel.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_off0000ee39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE39 5328 bytes
SHA-256: 37713b849c1bdc2662757a1f3e65bf9cfb215437a08f8362eadce5f10ee98dc8
font_01_sfnt_off00010052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10052 10916 bytes
SHA-256: c9e8aaf6a263b78a142c9476567213f33fad68334e2744bdae2609b6c0bd426e