Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64829e47579dfb2…

MALICIOUS

PDF

82.9 KB Created: 2021-09-21 15:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c18f6b4b4a98328e4781553539320585 SHA-1: 34d59e576981d9c677eed2db196719978f477dbd SHA-256: a64829e47579dfb21bc4c1f55169dc2b2912a993d7af972d227f1f194f07450d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to disposable domains and are structured as link farms, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and external links are consistent with a phishing lure or a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://oniceh.ru/uplcv?utm_term=how+to+get+xbox+emulator+on+android
    • https://derfo.info/resimler/files/50139550695.pdf
    • http://tlumacz-bialystok.pl/pliki/file/28396922653.pdf
    • https://baoholaodong24.baohohoanglong.com/userfiles/file/86975293346.pdf
    • http://nhatnamvina.vn/rich_editor/file/77839424398.pdf
    • http://wingmanplanningdemo.com/userfiles/files/4665810050.pdf
    • http://owv-sad.de/userfiles/files/joxazojubevuvifaj.pdf
    • http://sportservistocik.cz/UserFiles/File/digagudafupazifiso.pdf
    • http://alatasfilms.gr/ILC/img/file/60115540466.pdf
    • http://atsrealtyvietnam.com/upload/files/jejarixiboxevazare.pdf
    • http://www.memoriahistoricamalaga.org/ckfinder/userfiles/files/13564992254.pdf
    • http://world-spa-resorts.com/dok/864084318.pdf
    • http://offerparts.com/upload/files/16773344691.pdf
    • http://aranysolyomfeszke.hu/editor_up/fejojibuninorateb.pdf
    • https://muacash.com/webroot/img/files/bazarebewozefogemuwat.pdf
    • http://faizleathergloves.com/userfiles/files/linik.pdf
    • http://uniradioweb.info/userfiles/file/12191955555.pdf
    • http://studiorapizza.it/userfiles/files/laguwafowudezedigupu.pdf
    • http://tsnpharma.com/upload/files/roluwumonivugolowaz.pdf
    • http://daearesort.com/FileData/ckfinder/files/20210913_039896173B9A670E.pdf
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sebuburelan.pdf
    • http://tongkhomica.com/upload/files/nasovirilekopigexite.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc85.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC85 16792 bytes
font_01_sfnt_off0000f49c.bin
f11d10381f0e7dfec1262f69e6101ede053e97a2c95d58d0a9706a09716c4ce9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF49C 10844 bytes
font_02_sfnt_off00010d64.bin
fcf25bd368c6953c949a25fb64f0068c7faf08903822d09ddcd826ebd24f6cca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D64 18716 bytes

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