Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6870bc27f956517…

MALICIOUS

PDF

77.8 KB Created: 2021-01-20 05:25:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ab4ab136e0f6c044785ba97ec36a17cd SHA-1: 82d4693639b5980ae4ee0b831a770b7b55f95bdf SHA-256: e6870bc27f956517980e18d224942ef48f40b5ebc852b32585540a2287b3286e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'Toy story party supplies girl', indicating a phishing or social engineering attempt. The presence of external URIs and the link farm heuristic strongly suggest the document's primary purpose is to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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=toy+story+party+supplies+girl PDF link annotation
    • https://nujetamewude.weebly.com/uploads/1/3/4/8/134881912/54b6a2c3b0ce.pdfIn PDF document text
    • https://purelukanixavaj.weebly.com/uploads/1/3/1/4/131454065/3b7054a644ac71.pdfIn PDF document text
    • https://site-1174172.mozfiles.com/files/1174172/fobavibiwekavuderup.pdfIn PDF document text
    • https://site-1173429.mozfiles.com/files/1173429/digital_media_and_marketing_strategies_coursera_quiz_answers.pdfIn PDF document text
    • http://pepirizibizedel.22web.org/xabogadetowasetanonukuzud.pdfIn PDF document text
    • https://site-1168007.mozfiles.com/files/1168007/rugeguvatum.pdfIn PDF document text
    • https://site-1177097.mozfiles.com/files/1177097/siren_head_horror_videos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462694/normal_5faed92820580.pdfIn PDF document text
    • https://site-1176655.mozfiles.com/files/1176655/jaluzexavetowuvawadin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374843/normal_5fadf2f8ef601.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412568/normal_5fed63f288530.pdfIn PDF document text
    • https://gejizataki.weebly.com/uploads/1/3/3/9/133997606/befemaj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453720/normal_5feed1bc0ea93.pdfIn PDF document text
    • https://bakofegep.weebly.com/uploads/1/3/1/3/131382808/sejakaxirifudute.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374857/normal_5fa63539b7f25.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zefixufedinokas.epizy.com/moscow_metro_map_english_russian_2017.pdfIn PDF document text
    • http://vajexakatozezal.epizy.com/albion_online_new_player_guide_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/edible_fig_tree_information.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_off0000f263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF263 5036 bytes
SHA-256: bd5f7639dd0fa3ae1c7a02c1678969ac7e2a4b05400fa4e06aed0401c991a86a
font_01_sfnt_off000103a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A0 11384 bytes
SHA-256: 9b86c2a78cbc528c5bdf8dea145f98f979a0029dea85a6d3cd9f6fb596c1beb9

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