Malicious PDF — malware analysis report

Static analysis result for SHA-256 829c390702a237e6…

MALICIOUS

PDF

71.0 KB Created: 2021-09-18 19:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 266e239a155221b8d87de08dd68496f2 SHA-1: 073b02159fe7a53eb199a98b68bbab03c14be160 SHA-256: 829c390702a237e6b41885bf7023cb386c212bc0b2e6cf251f53fe9af66bca07
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external URLs, many of which are embedded within the document and point to other PDF files hosted on disposable domains. This behavior is consistent with a phishing campaign designed to lure users to malicious websites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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+email+a+picture+on+android
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/zaxupakuvilup.pdf
    • https://alaqart.atelierleuthold.ch/userfiles/files/16805067130.pdf
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/16482530725.pdf
    • http://hnc2.com/userfiles/file/90325783768.pdf
    • http://sun-green.be/ckfinder/userfiles/files/firizupobapegek.pdf
    • http://afro-safari.com/upload/files/dowuwavuzalidurasisabuno.pdf
    • https://hilanguage-com-tw.triangle-design.com/files/sojalobizixokudarob.pdf
    • http://35ct1.com/images/ckImageFiles/files/lepuraxamodib.pdf
    • http://nsdadventist.org/FCKData/file/82185524737.pdf
    • https://menu2uplus.com/images/file/58086774313.pdf
    • http://hiniceshine.com/upload/xamixuruwazefene.pdf
    • https://travelworld.ro/userfiles/file/gegid.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8daae67b0---43251686910.pdf
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1630685602_9014a1ca35.pdf
    • https://licorne-hotel-restaurant.com/userfiles/file/paveririfilezikelabaxanet.pdf
    • http://kartinatv.org/uploads/files/gaminor.pdf
    • http://www.euro-fly.eu/userfiles/files/30580150487.pdf
    • http://stellar-toys.com/ckfinder/userfiles/files/38479889070.pdf
    • https://kurtoglumob.com/upload/file/15387216486.pdf
    • http://okvin.org/userfiles/file/zofebudakazimiramekikete.pdf
    • http://www.fonfe.com/uploads/files/rovidaf.pdf
    • http://gespk.com/userfiles/file/93409382818.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613978e1a7b7f---wotukugulivoz.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_off0000b550.bin
444609deb5d93f9be8688af8066ab2c3d153627f47954970e212d46de49df421		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB550 16032 bytes
font_01_sfnt_off0000de5f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5F 16792 bytes
font_02_sfnt_off0000f676.bin
3e49d9e8c09ae29eaec808716a2745277c2ff624276b486b009f12b59ada7d86		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF676 10684 bytes

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