Malicious PDF — malware analysis report

Static analysis result for SHA-256 bad7d2a2e5842fa4…

MALICIOUS

PDF

76.7 KB Created: 2021-03-31 03:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 456385a99b443f8d2fc2495fc97b4ef1 SHA-1: 1eaa20c7e49a11bd1bcced72ec2c9503d04f87d2 SHA-256: bad7d2a2e5842fa4b40b1e50bb34087ae79aa5ab17650126fb33fca89dc83273
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 or trojan. It contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'paper mache letters diy' and 'wkhtmltopdf', indicating a potential lure or disguise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://mezovuduw.ru/wix?keyword=paper+mache+letters+diy PDF link annotation
    • https://cdn.sqhk.co/nukusigemug/ifEiajh/kudapokigivomigomuwifefa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501486/normal_5fe092c3c3051.pdfIn PDF document text
    • http://bit7.top/how_to_program_a_chamberlain_garage_keypad6iglk.pdfIn PDF document text
    • https://cdn.sqhk.co/mepapogivoma/igfEheb/tuvakival.pdfIn PDF document text
    • http://good-production17.site/74770371630yo4nm.pdfIn PDF document text
    • https://cdn.sqhk.co/sowojusawepu/W5gidhc/12110803584.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419820/normal_5fe15fbc3fa66.pdfIn PDF document text
    • https://cdn.sqhk.co/zivupowixede/1jjmgf7/26307297726.pdfIn PDF document text
    • https://cdn.sqhk.co/gajalalike/igjhqgg/nukikuwitimelasukanamam.pdfIn PDF document text
    • https://cdn.sqhk.co/titabofasika/gfE6ujb/69600965679.pdfIn PDF document text
    • https://cdn.sqhk.co/xoresarib/B6XHgi2/uncertain_definition_wikipedia.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413368/normal_5fca46d95a275.pdfIn PDF document text
    • http://organicsss.space/influence_synonyms_wordcotlg.pdfIn PDF document text
    • http://salet.store/57192448780cgbwm.pdfIn PDF document text
    • https://cdn.sqhk.co/bujavenizake/cgcgfjg/invasion_of_the_body_snatchers_pods.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380078/normal_5fcce1e7d5766.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/petubapizo/rakupuwagaweviv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fae44d2a-8e08-4093-8f4f-041e862fe10b/61578034822.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56fdff31-f3fa-4f39-b07d-5c4f36884ef1/derechos_humanos_universales_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/griffith_experiment_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/rhetorical_devices_in_i_have_a_dream_speech.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/jagojorumisod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d143648-e823-4693-aac1-121e89006355/24915356267.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_off0000ec0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0D 5416 bytes
SHA-256: 8798f3f1b115f6292dbce37c9cbb9d28c2b10a4561942089746d4626f0e290ec
font_01_sfnt_off0000fe52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE52 11268 bytes
SHA-256: e415df3994b099504a623f9b389ea5eaed73314f2125d6e47438f99afb88b202

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