Malicious PDF — malware analysis report

Static analysis result for SHA-256 586ea67255d0a581…

MALICIOUS

PDF

69.5 KB Created: 2021-10-02 13:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 30bd12f17dea0c383f86af3d4fc7c65a SHA-1: d7a48fcea42f4599f11eb6efc4bcbd2c9509493e SHA-256: 586ea67255d0a5810a283571a3d81efec0e66966b5b4ceabfd298dcc41c70639
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM, indicating a high likelihood of malicious intent. The ML classifier and ClamAV also identified it as malicious. The document contains numerous embedded URLs, many of which point to potentially disposable domains, suggesting a link farm or phishing lure. No scripts were extracted, but the structure and URL patterns are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://mcap.cz/images/uploadedimages/file/gujakino.pdf
    • http://tikatalog.sk/_files/file/7797413358.pdf
    • http://dr-onesrl.com/userfiles/files/gewigavekivexiditiguzo.pdf
    • https://tainandentist.com/uploads/files/202109151157199559.pdf
    • http://cheapstandard.com/uploads/files/tiwemefobodejadawe.pdf
    • https://signatureshreyas.in/userfiles/file/xoloreputexowotig.pdf
    • http://saaretravel.ee/images/file/wigijexudelefegub.pdf
    • https://langumeistras.lt/i/File/19521702094.pdf
    • https://aslplastic.com/ckfinder/userfiles/files/69522926920.pdf
    • https://sanipacific.com/attachment/file/91171929092.pdf
    • http://hndgyl.com/v15/Upload/file/20219101834329602.pdf
    • http://dinhvi5s.com/images/newtech/files/94472490883.pdf
    • https://strechybenesov.cz/content/dawezimafujomogufenodisi.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16151708dada59---jarinavisenapot.pdf
    • http://bdsductri.com/upload/files/54982972093.pdf
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/rofigelogope.pdf
    • https://bodzlomu.com/userfiles/file/dijet.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/afc034ee09283e553c43a3fc75ca8278/35924290140.pdf
    • http://hattingtoemrerogsnedker.dk/userfiles/file/33446572080.pdf
    • http://sportingfoundation.com/uploads/file/puwuwujodapefigul.pdf
    • https://phunhai.net/upload/files/jivewokekikedurulu.pdf
    • http://hainfelderteich.at/jikigazeluwelubuzi.pdf
    • https://palezieux.com/ckfinder/userfiles/files/xevefuzet.pdf
    • http://www.aamuhsv-madisonalumni.org/files/files/61994070793.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=meaning+of+industralization
    • 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_off0000b2fe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2FE 16792 bytes
font_01_sfnt_off0000cb15.bin
673f705c1d2985fc200579a27de88d7cb8398b8ad272d7c28050b2b2f48953bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB15 10680 bytes
font_02_sfnt_off0000e37f.bin
649451449037d37961ab5ecfbd4fc6a7326c604e4195ae770a5f549690c59815		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE37F 14616 bytes

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