Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c54c3eb44cdfa7d…

MALICIOUS

PDF

75.8 KB Created: 2021-02-28 07:17:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: b1bec7b9a9aceb8aa5c7866ac801d1b5 SHA-1: e6725dcbfcbd1fec4c71c912d05b7cfdff3a734a SHA-256: 7c54c3eb44cdfa7d98372b608d74c67873695de6b888b0ed60c7c91b46575a20
126 Risk Score

Malware Insights

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

The PDF document contains embedded URLs that lead to disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to engine maintenance, directing users to a suspicious URL.

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://midufefew.ru/123?utm_term=maintenance+on+briggs+and+stratton+engine+specs+chart PDF link annotation
    • https://cdn.sqhk.co/nebinefis/hd0mii4/love_stories_tv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471467/normal_601692fb16119.pdfIn PDF document text
    • https://cdn.sqhk.co/wogokodu/sjcgfji/pepunabi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444353/normal_603358bf51d8d.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/english_grammar_in_use_elementary_fifth_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/vurikede/XghfMhf/camping_near_mendocino_ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449614/normal_5fd2e32733065.pdfIn PDF document text
    • https://cdn.sqhk.co/rubekafux/rwidid6/boy_golf_games_online.pdfIn PDF document text
    • http://barajofa.mywebcommunity.org/tenuzawusopebuledefuli.pdfIn PDF document text
    • https://cdn.sqhk.co/gutifusuf/equoLge/creative_school_supplies_diy.pdfIn PDF document text
    • https://cdn.sqhk.co/givifevulo/19hcgjo/where_to_buy_love_balls_pokemon_shield.pdfIn PDF document text
    • http://figimumagoko.mygamesonline.org/38210380997.pdfIn PDF document text
    • https://cdn.sqhk.co/surikuzezun/LlWjiGy/dezigopepuben.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/zuturibidojazipipivud.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/tosafuxow.pdfIn PDF document text
    • http://tevefetilojas.atwebpages.com/lubosiwotitil.pdfIn PDF document text
    • http://fiforeru.atwebpages.com/74463879401.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_off0000eb7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7B 5448 bytes
SHA-256: 4596cf2fd46f015e43c865de8f17202ff2595b0b7e0efb8e48d5e1ffcaa0ee3e
font_01_sfnt_off0000fdfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFE 10488 bytes
SHA-256: 38b23853d821f58b78e7f3727266ec74a36e2602904e958e500ebd2d165912ee

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