Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d4482c42dd44033…

MALICIOUS

PDF

81.3 KB Created: 2021-03-02 23:26:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 20643f119f3495bcc9613484c561a35a SHA-1: 3218b285b55994d5b75f33150d2685403d610264 SHA-256: 1d4482c42dd4403372d5de871c55e72376fc428e3394f853c8188fe2a6e5bcc1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, likely for further exploitation.

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://zajinet.ru/wix?keyword=dewey+decimal+system+worksheet+pdf PDF link annotation
    • http://mixezitubut.mygamesonline.org/12792951756.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/Qgg9fjg/55527071129.pdfIn PDF document text
    • http://gudokav.sportsontheweb.net/tom_sawyer_movie_1973_cast.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizufofuj/2gggghd/58242398043.pdfIn PDF document text
    • http://xuxijosut.sportsontheweb.net/how_to_clear_google_search_history_on_my_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/suxavawudomo/inngehJ/vimobuzesot.pdfIn PDF document text
    • http://tuvivukaroj.mygamesonline.org/1962_roman_breviary_app.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/2vThjdU/folekurazilaluxuvebofu.pdfIn PDF document text
    • https://cdn.sqhk.co/xiladuxe/xieJje0/pipetidozusewowufud.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/godoremitiwuja/balancing_chemical_equations_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/education_queensland_lesson_plan_template.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/antiphospholipid_syndrome_treatment.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/69078030747.pdfIn PDF document text
    • https://s3.amazonaws.com/lusegokaves/black_lightning_season_1_episode_8.pdfIn PDF document text
    • http://zitasixan.atwebpages.com/guvutepuwupolosumo.pdfIn PDF document text
    • http://ratobewiwigu.atwebpages.com/lanebowirenuxadoril.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_off0001015a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015A 5652 bytes
SHA-256: 182fa2d6ab5d2dc9c4a323c77ab62c9755e664ddc15e4096c86488c8f7d97ec9
font_01_sfnt_off00011481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11481 10396 bytes
SHA-256: 337f4a9a21b4651bbcc7ff23ee6428c594fef6fe177576cab6b996f6e63de48e

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