Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf718f11b4aa817…

MALICIOUS

PDF

85.1 KB Created: 2021-03-10 07:42:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: a0c76b59f55e421e6d0da2443bb10204 SHA-1: a9ed5b2e75d1a2d324a1e0f30d7b4285bff5b1d6 SHA-256: 6cf718f11b4aa8171ffca03b56efe8ecebef363e07f5bcd074ad59bfbe986029
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

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://maypoin.ru/123?utm_term=beautiful+birthday+cake++pictures PDF link annotation
    • https://zanobevaduj.weebly.com/uploads/1/3/2/6/132682049/pofajifavemew.pdfIn PDF document text
    • https://bamufikike.weebly.com/uploads/1/3/1/6/131606241/gikititaro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502236/normal_60187cec5a4ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464303/normal_5ffe0e70b5acb.pdfIn PDF document text
    • https://dotawipe.weebly.com/uploads/1/3/5/3/135323210/dofefisufi-xixajewarilevas-vudalapewaki.pdfIn PDF document text
    • https://dasirexifavud.weebly.com/uploads/1/3/5/3/135320576/pediz.pdfIn PDF document text
    • https://fexowisidirap.weebly.com/uploads/1/3/4/8/134868585/lekusasijunoweroxib.pdfIn PDF document text
    • https://zawasofolebu.weebly.com/uploads/1/3/4/9/134902788/1082725.pdfIn PDF document text
    • https://tafulagi.weebly.com/uploads/1/3/4/6/134608062/puniwapulolese.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401732/normal_5fe6531642d61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387040/normal_5fe7a9ffa90bc.pdfIn PDF document text
    • https://vakenufepuxino.weebly.com/uploads/1/3/4/5/134529081/6814923.pdfIn PDF document text
    • https://derovidexaw.weebly.com/uploads/1/3/1/3/131382126/b59f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365624/normal_5fdd055f40c34.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://590703a0-be71-4d3c-a49f-17767d5969ef.filesusr.com/ugd/656c20_c27d749ff26b43199e73ce6cd58e865b.pdf?index=trueIn PDF document text
    • https://d71fc03c-aea6-48f7-a990-8afffb22108d.filesusr.com/ugd/3de8a6_5270d444637e427dbfe06884e04a98d6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jagux/whites_goldmaster_gmt_metal_detector.pdfIn PDF document text
    • https://b133b025-67d1-4190-9e53-fbb99503dec2.filesusr.com/ugd/caf13f_147493e5190148059081deca363a1043.pdf?index=trueIn PDF document text
    • https://aed022ca-8a9d-452d-9022-56a74a585a14.filesusr.com/ugd/4d548e_f55dec59b12f49498b87170fde7bca52.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c070090a-13fe-42f5-8620-8aac7a4ade82/pioneer_elite_tv_no_speakers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88ad5cba-9fee-4787-8f8a-5188948714a3/19965911505.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/bloodsail_buccaneers_rep_guide_legion.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_off00010a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9F 5600 bytes
SHA-256: 6d02d7416b4a59e80c8503b939bbc1db775a6c3379c6b4acaeb102fc14999994
font_01_sfnt_off00011da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA6 12428 bytes
SHA-256: 8ec385e91521bf38662e8151158365cdf1d69b8a6cd4f52321b2a3222032a279