Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ea849a3e0c00b4d…

MALICIOUS

PDF

74.4 KB Created: 2021-05-12 02:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 78fa4539f806993cd073e341a3c34f44 SHA-1: 79fff396fb310afd0e1916a323cbb2b838451f5e SHA-256: 3ea849a3e0c00b4d742c4e100e60525d656202c3701beabcbb48d79feaef2636
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, many hosted on disposable domains, suggesting a link farm or redirection infrastructure. The document body, though partially corrupted, contains text related to appliance repair costs and mentions wkhtmltopdf, indicating it was likely generated by a tool. The presence of external URIs and the overall structure strongly suggest an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://seumenha.ru/strik?utm_term=how+much+does+appliance+repair+cost PDF link annotation
    • https://pexazunawilaga.weebly.com/uploads/1/3/4/2/134265520/1d0cb929b.pdfIn PDF document text
    • https://bexudedumazises.weebly.com/uploads/1/3/1/4/131406785/77ff24f.pdfIn PDF document text
    • http://wejuzofibab.medianewsonline.com/natobugonunawudumaposo.pdfIn PDF document text
    • https://cdn.sqhk.co/sebutarukaw/hhhehaz/dafegi.pdfIn PDF document text
    • https://jowiroluka.weebly.com/uploads/1/3/4/3/134336896/8974329.pdfIn PDF document text
    • https://pufodafu.weebly.com/uploads/1/3/5/9/135959320/f43a0c3.pdfIn PDF document text
    • https://cdn.sqhk.co/pofoxubo/heKhchc/ropuviridawejizef.pdfIn PDF document text
    • https://wovufimi.weebly.com/uploads/1/3/5/3/135327312/c37eab4bd46.pdfIn PDF document text
    • https://vonarepovuwogi.weebly.com/uploads/1/3/4/7/134728891/napezanitibejo.pdfIn PDF document text
    • https://betedodokadez.weebly.com/uploads/1/3/4/8/134882186/sonad_xuxozu.pdfIn PDF document text
    • https://binazinir.weebly.com/uploads/1/3/4/1/134108718/6163372.pdfIn PDF document text
    • http://vumajuzatijerak.getenjoyment.net/sukakoxifezavowir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tososite.onlinewebshop.net/borogivasigazekage.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/73460269971.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/66793371612.pdfIn PDF document text
    • http://zezofakarol.myartsonline.com/zafixatezaxelox.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/the_curated_closet_workbook_free.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/hp_elitebook_2560p_battery_not_charging.pdfIn PDF document text
    • http://pojozija.onlinewebshop.net/36764666249.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_off0000e712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE712 5368 bytes
SHA-256: 8b51704fbdba50bc996736cbed948e73c69ff419571a45d6f644d066613334fd
font_01_sfnt_off0000f933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF933 10184 bytes
SHA-256: 3f6372310a2866a4fcf058ef477654fb5aaa90e51e49e7e219f011c6762d0178

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