Malicious PDF — malware analysis report

Static analysis result for SHA-256 06c64f26b76be11c…

MALICIOUS

PDF

110.0 KB Created: 2021-09-21 07:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a60f86d8f9478f5301cfd92606dfd11b SHA-1: cbb8ef6ec20a8a7b89c7ed1585a938186386801f SHA-256: 06c64f26b76be11c258edbf7e0e9955a1a98be5005d4ae9b9303192a87b34a6e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and utilize UTM parameters, suggesting a phishing or link-farming campaign. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://allytemp.ru/uplcv?utm_term=attack+on+titan+light+novel+pdf
    • http://att-na.com/upload/42156167987.pdf
    • http://razaviota.ir/basefile/razaviotair/files/zupuvajadexaza.pdf
    • http://abwingstop.com/uploads/files/vekunikep.pdf
    • https://ottopianos.nl/files/72955102864.pdf
    • http://hanart21.com/files/userfiles/file/11800622234.pdf
    • https://madame-tina.com/ckfinder/userfiles/files/zedekaxivepuvizizudo.pdf
    • http://grawerlik.pl/userfiles/file/wadogonesepivilu.pdf
    • https://sangolongphuong.vn/longphuong/news/files/pofalevineso.pdf
    • http://appli-veolia.net/ckfinder/userfiles/files/43461785040.pdf
    • http://lohoithaiduong.com/uploads/files/84127406628.pdf
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/lupepozaxewinojam.pdf
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/tixiwilisi.pdf
    • https://macroedunet.com/userfiles/file/87913877805.pdf
    • http://aviatechinform.ru/sadm_files/niminuwidijus.pdf
    • http://carbontuning.ru/file/pakuzipigeloruf.pdf
    • http://gibisch.com/files/files/zifotijogoxukenepupizaki.pdf
    • http://arsvet.ru/img/upload/47984929936.pdf
    • http://pumarecovery.com/userfiles/files/wuponedaro.pdf
    • https://hazeloyun.com/calisma2/files/uploads/pexapupitafitakix.pdf
    • http://www.verneteco.com/ckfinder/userfiles/files/fikimenujefifuwolida.pdf
    • http://trip-sale.ru/userfiles/file/78501716491.pdf
    • http://urdu-hadith.com/survey/userfiles/files/fetadusotoxuwutazudim.pdf
    • http://makeyourpartnermelt.com/userfiles/file/2549404443.pdf
    • https://perfumes.dropship-tracking.com/userfiles/files/88745329764.pdf
    • http://www.fishandcosolicitors.com/uploads/files/mepepagowiwo.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_off00013821.bin
a6ee1a5c818ad4e91dedff8ff226d9df067a78fa0f594b64ffc200ed40209353		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13821 10772 bytes
font_01_sfnt_off000150b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x150B9 16792 bytes
font_02_sfnt_off000168cb.bin
4b8cec7f533d9cef5352a816d0a92320339a58993a7b04ff65b4afea7ee738c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x168CB 26180 bytes

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