Malicious PDF — malware analysis report

Static analysis result for SHA-256 72690102bcc26b89…

MALICIOUS

PDF

104.1 KB Created: 2021-09-19 19:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 93bb8189f8f4660267a44f6fef8755bd SHA-1: 0a34595a9cd126cc756730c0bf38a314cbcf0b27 SHA-256: 72690102bcc26b89935e888bffe53c84d6826c7b78608a9373adf1a274fa0611
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The PDF structure itself, along with the presence of external URIs, suggests it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9618

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://equator-maritime.com/userfiles/file/24893907438.pdf
    • http://duquenne-moteurs.fr/webroot/upload/files/vutararelekaf.pdf
    • https://peptidturkiye.com/ckfinder/userfiles/files/wobegeturarajojopategibiw.pdf
    • http://geyuping.com/geyuping/uploadfile/file/2021091804372973499.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/i5aj1kblqm6l31onu6lsdrprp8/nefewener.pdf
    • http://www.radio-kum.si/data/files/3384522508.pdf
    • http://lifecontinues.ru/images/files/86238178116.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/24fbb51675c908f69839dffdecb71b77/dupubewitedapexawafike.pdf
    • http://miet-boot.ch/images/uploadedimages/file/kugamizirivafaxulu.pdf
    • https://virtrade.gr/userfiles_lybo/file/sidev.pdf
    • http://boathousebrokerage.com/userfiles/file/16360902212.pdf
    • http://poliinc.com/upload/files/kiditufazilefafu.pdf
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/51113027346.pdf
    • http://gaia-onlus.org/userfiles/file/jifube.pdf
    • http://nfrostov.ru/upload/files/nubuxodewebuvabixaja.pdf
    • http://universalestetic.com/userfiles/file/jozudulabawoketifuvanu.pdf
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/javexelonu.pdf
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/kafonek.pdf
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/xaxagitizupesadiguvaxun.pdf
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/43339902153.pdf
    • http://norilsk.torbay.ru/images/uploads/file/taledulotoreda.pdf
    • https://darshanam.com/ckfinder/userfiles/files/32497496147.pdf
    • https://casalindasbakery.com/ckfinder/userfiles/files/39337447696.pdf
    • https://heks-tech.com/app/webroot/userfiles/files/64497672465.pdf
    • http://swotaweb.com/img/upload/file/tunumel.pdf
    • http://jca-t.com/fck_image/file/wigepedunedo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=guilty+pleasures+laurell+k+hamilton+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off000172e5.bin
ef334b6389a9673db2578bd46fd7fd369f2490a9b86fd82e1f54248e002869db		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x172E5 18992 bytes
font_00_sfnt_off000110b4.bin
2bd824944c43f84bf5d27d3079dccf9f76ba40d7cc3f4423d91d67ccd67ebc2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110B4 18740 bytes
font_01_sfnt_off0001410c.bin
491ea994e0c8c5215ffefaa82cc7ef0eadb4be0a5fe2675a8d65b909b3b10d2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1410C 11108 bytes
font_02_sfnt_off00015ad4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15AD4 16792 bytes

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