Malicious PDF — malware analysis report

Static analysis result for SHA-256 8733877c1cd336c1…

MALICIOUS

PDF

98.5 KB Created: 2021-02-25 03:40:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 0ec4e7ffdd412d8f1d5f55cd5e0f4f3a SHA-1: de94cc2705e6ee58de94c55cd3991bd98d684e6a SHA-256: 8733877c1cd336c1ab2f9ec8fa936527c0a14608a6bc1cebefb41cf0ccd088bd
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains or link farms, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', indicating it was likely generated by a tool rather than being a legitimate document.

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://druttle.ru/123?utm_term=murder+on+the+orient+express+book+description PDF link annotation
    • http://pofuxubilet.sportsontheweb.net/second_grade_spelling_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/vifamepupib/ji6BhjQ/nys_marketplace_insurance_login.pdfIn PDF document text
    • https://tisemijosugimuv.weebly.com/uploads/1/3/1/0/131070246/nidaju.pdfIn PDF document text
    • http://wuteziben.iblogger.org/attack_on_titan_season_4_manga_chapter_137.pdfIn PDF document text
    • https://tijikazi.weebly.com/uploads/1/3/4/3/134373218/1d5d922bd9de6.pdfIn PDF document text
    • https://popupobapovuzus.weebly.com/uploads/1/3/4/0/134012290/a0a78.pdfIn PDF document text
    • http://filanion.online/52320256495zdr8w.pdfIn PDF document text
    • https://cdn.sqhk.co/posebozej/hO1RheD/mewatowiripibalemapufozu.pdfIn PDF document text
    • https://fakilopatezi.weebly.com/uploads/1/3/1/6/131606638/60895a4a35.pdfIn PDF document text
    • http://trylait.club/mukudivosanaguravalosigt0ypd.pdfIn PDF document text
    • https://cdn.sqhk.co/xopuwatipo/haVjis5/kidz_bop_live_tour.pdfIn PDF document text
    • https://xisuludibu.weebly.com/uploads/1/3/5/3/135300694/402928.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pubitawiwinas.rf.gd/zurexiluxiz.pdfIn PDF document text
    • http://todugiremo.epizy.com/magnetic_curtain_rod_brackets_home_depot.pdfIn PDF document text
    • http://fudewalazakukug.epizy.com/vopujatili.pdfIn PDF document text
    • http://rizivubonulej.atwebpages.com/bolens_riding_lawn_mower_spark_plug.pdfIn PDF document text
    • http://javuxanasojajex.epizy.com/70707942128.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000132b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B3 4068 bytes
SHA-256: 51533bdb0e4521c29fb68e4b0c7ac73fe2e71b3973130c2b45a83f329b8f9667
font_01_sfnt_off0001412b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1412B 5196 bytes
SHA-256: c08d37401e90caf488a1a1f7ef28fd47656cdc2ceabd861e427bac30d6a46d6e
font_02_sfnt_off000152db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152DB 12732 bytes
SHA-256: e4f8dc01438510cc09f0665406d61d5c2743c523f363c420fee29130d72b03ab

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