Malicious PDF — malware analysis report

Static analysis result for SHA-256 a128eafabf349ad7…

MALICIOUS

PDF

82.3 KB Created: 2021-03-09 10:54:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c95e5c623573841061148ff24d82a7fc SHA-1: 5f2c370770d0aeba0716559e9fd80ff8731c5bce SHA-256: a128eafabf349ad71869223f8a4d78500d509a6062a070ffe61648e7ebc84476
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/award?keyword=livre+algorithmique+dunod+pdf PDF link annotation
    • https://mazerobuwi.weebly.com/uploads/1/3/1/3/131398334/rebobonidefe_jilev.pdfIn PDF document text
    • https://cdn.sqhk.co/dixufeja/hbihJhc/bapalomolofegogikejivanim.pdfIn PDF document text
    • http://wegisinebirixe.iblogger.org/76303544824.pdfIn PDF document text
    • https://cdn.sqhk.co/giwegulatil/cgjieIS/imo_live_video_call_app_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wisaputal/lnVibwZ/todexifebuxod.pdfIn PDF document text
    • https://cdn.sqhk.co/xiselaza/XmhjfSV/xiwazadojedixipategab.pdfIn PDF document text
    • https://nurafotupitu.weebly.com/uploads/1/3/4/4/134495453/rukikuven-jopijo-xazam-wodelaxepixu.pdfIn PDF document text
    • https://farevilifowo.weebly.com/uploads/1/3/5/3/135390938/7022328.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4f65703b-d4c0-4c9c-9e30-73c8cc83ec5d.filesusr.com/ugd/54fa57_cb521afd12ea497394783ad33e99cf5a.pdf?index=trueIn PDF document text
    • https://53860ffb-5975-4088-b838-5c82367c2827.filesusr.com/ugd/0d2908_194eaf11aed646b29dca46b3409e2942.pdf?index=trueIn PDF document text
    • https://ccd4a2e6-63e2-4dcb-a02e-1ae1253dabcc.filesusr.com/ugd/059ff1_240059d713ba4a0d97052bf34e7ec2c4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f03f04b-e0d2-4f64-a36f-5ca168089ccc/wejakezolowozokivoxazupu.pdfIn PDF document text
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_ae4c9f5b653444f583fc8d5202619cf7.pdf?index=trueIn PDF document text
    • https://86f5e18a-8766-4ae7-b9bf-31430b627380.filesusr.com/ugd/911c12_53224c85752d4dd193ea270aafd8254d.pdf?index=trueIn PDF document text
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_ea80801ca2234c8eb0915406df6ca266.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfb83e6d-a3ff-4870-9a11-0c29a7801e11/how_to_do_tongue_and_groove_with_a_router.pdfIn PDF document text
    • http://tomafidom.rf.gd/bizasutojax.pdfIn PDF document text
    • http://niwerujegip.epizy.com/befapijemosizaf.pdfIn PDF document text
    • http://vatilibudavelit.rf.gd/jagerigokif.pdfIn PDF document text
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_a70bfa7a4f924fb299487dbef0cd5f06.pdf?index=trueIn 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_off0000ff2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2E 5404 bytes
SHA-256: 0bd7e96d55d562d03e29ba75bfc15389c8cd063484b7fdd729d032c97485ff44
font_01_sfnt_off00011166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11166 12836 bytes
SHA-256: 008ee1ffd5afecd323a3bc22b5624f1fb53ed06595b33a83bd02817010bc7373