Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffaddbed7e1e1181…

MALICIOUS

PDF

75.9 KB Created: 2021-03-30 12:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da61a446a08d9d6cb1ad7d1442aa1b3f SHA-1: 21ed647c87b80777fa8dc76c17c952306d4c66bc SHA-256: ffaddbed7e1e1181e8f3847539b38943665641e2443000cf073de65baf706648
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and ClamAV, indicating it is likely a phishing or malware distribution attempt. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the ML classifier's high confidence score further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/aws?utm_term=grade+2+mathematics+book+pdf
    • https://sesuzefodapu.weebly.com/uploads/1/3/2/8/132815176/8424518.pdf
    • https://cdn.sqhk.co/vogigoda/igKYJgj/44594887197.pdf
    • https://mujunoba.weebly.com/uploads/1/3/2/6/132682006/pakud_ronopugare.pdf
    • http://bt-management.website/tonixuzodefz5zr.pdf
    • https://monemoret.weebly.com/uploads/1/3/4/6/134667898/9fe0e1d7c67.pdf
    • https://xefakiradu.weebly.com/uploads/1/3/1/8/131856624/gebokuwujavoxamo.pdf
    • https://cdn.sqhk.co/xelalizogim/Xk2qHB7/buxizobuxera.pdf
    • https://cdn.sqhk.co/balatexoriv/jbofoie/21928486130.pdf
    • https://daliroxemonove.weebly.com/uploads/1/3/0/7/130775241/5876892.pdf
    • https://cdn.sqhk.co/mawejoxejobe/ePgjplP/uae_exchange_online_transfer_promo_code.pdf
    • https://cdn.sqhk.co/kitolitik/icpibic/27035955646.pdf
    • http://fasibada.22web.org/montagues_and_capulets_prokofiev_piano_sheet_music.pdf
    • http://natorg.fun/samsung_bd_f5700_remote_codes9lmov.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8d90b851-447f-4cfc-ac95-1e867b71b983.filesusr.com/ugd/b371d9_7d3eb268696b42b48f1974b92876724d.pdf?index=true
    • https://2c0370cf-43ec-4dc9-8589-ec1e7793a70d.filesusr.com/ugd/404058_af63c762e6784e3c8d9736fe25e3be1e.pdf?index=true
    • http://dimakuzirefew.rf.gd/xuzivutujopujanelulos.pdf
    • https://c3438639-6a75-4920-aa4f-d1e0b619354f.filesusr.com/ugd/3be3a7_25188ee74b664c5bbb82de522c0685e4.pdf?index=true
    • https://bb491b24-4c81-4ccc-8daa-bf1baeb171c2.filesusr.com/ugd/93c935_b8e6430f193a4c2c81012d39157dd392.pdf?index=true
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_3da9cf65aa0d4b8ab1c70ec02d738bc8.pdf?index=true
    • http://dominomufu.rf.gd/22468633209.pdf
    • http://bikutuvuxaxixo.epizy.com/best_app_for_reading_the_bible.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9db.bin
d1c3454cf9bf917ad811adfe79cd34e112139487f89e1b11ceb57c1e0549d919		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DB 5732 bytes
font_01_sfnt_off0000fd30.bin
dfbebd6864acc851a3fec10364e366c4d9449d04ef6755423ddeb5e6a3bf2a61		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD30 10980 bytes

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