Malicious PDF — malware analysis report

Static analysis result for SHA-256 f382f69c281e664d…

MALICIOUS

PDF

93.9 KB Created: 2021-02-21 03:09:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 74c34e155b48306ce2ce8aa1fe3af980 SHA-1: d6cb755f29d7c938871ebe077a6cd956cef6e243 SHA-256: f382f69c281e664db5d1a17d3212f283e0d302d50018b1ad857a3024502d6470
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 of which are part of a link farm hosted on disposable domains, indicating a strong intent to redirect users to potentially malicious sites. The document body, though heavily obfuscated, suggests a lure related to 'Bunn slush machine shaft seal maintenance', which is likely a pretext to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/strik?utm_term=bunn+slush+machine+shaft+seal+maintenance PDF link annotation
    • https://zoxiniguve.weebly.com/uploads/1/3/4/5/134584112/wosifelitowabem_dezib.pdfIn PDF document text
    • https://cdn.sqhk.co/riwaxagi/vBsL8if/40817460634.pdfIn PDF document text
    • http://gipoletuzemixol.iblogger.org/tosugenarev.pdfIn PDF document text
    • https://sarowamirubene.weebly.com/uploads/1/3/4/7/134736793/malam_nofever_gufug_piwozeviti.pdfIn PDF document text
    • https://gadetuzajuvi.weebly.com/uploads/1/3/4/8/134850054/duviredujidumoliraz.pdfIn PDF document text
    • http://mananeje.66ghz.com/deziwidugikukenorimu.pdfIn PDF document text
    • https://vefamomapebimid.weebly.com/uploads/1/3/1/4/131406391/xepano.pdfIn PDF document text
    • http://brosbass.com/gutararubega29kem.pdfIn PDF document text
    • http://rollernefritmassage.xyz/pepper_s_desk_iron_man_2g05ka.pdfIn PDF document text
    • https://cdn.sqhk.co/lajefage/gKYZDZc/29343613901.pdfIn PDF document text
    • http://bio-ita.fun/pixel_car_racer_hack_android_2020cxgh9.pdfIn PDF document text
    • http://majelogajizivo.iblogger.org/cabinet_parts_pro_manual.pdfIn PDF document text
    • http://pe50off.info/nubuzenobavivo4mkuf.pdfIn PDF document text
    • https://cdn.sqhk.co/butituguxur/idUiehd/brain_line_ball_physic_puzzles.pdfIn PDF document text
    • https://cdn.sqhk.co/tusifefovozu/4KheFje/79071199082.pdfIn PDF document text
    • http://naykaryadom.fun/595598380693m70c.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/zerejibixupav/super_smash_bros_wii_u_bayonetta_guide.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E60 5072 bytes
SHA-256: 68ce021abfdc773c2dff111361c5cdf65c9700f16585d8aa538af7efa2b03dcb
font_01_sfnt_off00011f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7B 16388 bytes
SHA-256: ed187bed704c6e8934b3a28c70f6a8d1099e703909b927f6965bb2d9b2a58171
font_02_sfnt_off00015313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15313 16112 bytes
SHA-256: 04c641d0aedeaa8c494855f42a2e9ae6fad9e3679126e7dc5c08fccc4b41c292

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