Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb291488f2f7e84a…

MALICIOUS

PDF

76.9 KB Created: 2021-03-13 23:22:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 7912d65d1a3717e50cb611daeecf47b2 SHA-1: ccff5f0761a30c409b3c8d843225f9a18b1a91e6 SHA-256: bb291488f2f7e84ae2219e59135ece12ce686e1c5ce8c0c7395ec99f3c465054
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 numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, references 'foolproof module 9.20 answers', likely a pretext to entice users to click on the embedded links.

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://kuzutuzo.ru/wix?keyword=foolproof+module+9.20+answers PDF link annotation
    • https://zurufapejol.weebly.com/uploads/1/3/0/7/130739524/ccaecc52de9aceb.pdfIn PDF document text
    • https://dunopupusegujuz.weebly.com/uploads/1/3/4/3/134348927/letexegi.pdfIn PDF document text
    • https://vagerama.weebly.com/uploads/1/3/4/7/134767853/2121440.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377380/normal_600127089ae00.pdfIn PDF document text
    • http://davupopebuwiser.sportsontheweb.net/sonanekadudasamaro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390068/normal_5fd93c5ac7d58.pdfIn PDF document text
    • https://vizodifoberesin.weebly.com/uploads/1/3/4/9/134900429/1145143.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372383/normal_5fdb76acbb02c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9959830-5a47-4b13-bf35-ab430ea5cbd3/stihl_ts420_carburetor_fuel_line_diagram.pdfIn PDF document text
    • https://968bac2e-1409-45a7-bd11-2c37eba47390.filesusr.com/ugd/c81504_bf799f5550fb41e7a930130323c6add4.pdf?index=trueIn PDF document text
    • http://ginowane.onlinewebshop.net/how_to_use_prayer_beads_pagan.pdfIn PDF document text
    • https://f3b8d348-8566-49c9-a9f8-a2c3b9e1bc8e.filesusr.com/ugd/f1c748_f247e26d1f7b47c181d763c722b9b72f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/afe8ea51-35d3-4253-93c1-5f1547d24651/solving_calculus_problems_step_by_step.pdfIn PDF document text
    • http://wokoxut.epizy.com/ruxazujavajigabiwala.pdfIn PDF document text
    • http://kafuxipadirates.rf.gd/nigamanuwukenidemusu.pdfIn PDF document text
    • https://9539e3d7-93ad-434a-85ac-22bd9bdb82bb.filesusr.com/ugd/df7b34_5ef532fcb8434f10bf08467d495fdfd0.pdf?index=trueIn PDF document text
    • https://89f68ddc-9f98-4e60-8afa-3e0ca6603e9e.filesusr.com/ugd/4725f1_8d9d20d067974e21acb4f425b43083cc.pdf?index=trueIn 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_off0000edc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC8 5696 bytes
SHA-256: c4cfcb6b01b605edb9278e46ea701b430421406bbb1c944f8cc72f46ffb11a50
font_01_sfnt_off00010125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10125 10904 bytes
SHA-256: c011970f17d3727ca8e165ac7e025b16bd9006e16085fd74713c65c28e227fb8

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