Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe19985187be01f8…

MALICIOUS

PDF

83.2 KB Created: 2021-09-10 11:30:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ffdc010eea67b024281ef07dd83b1c9 SHA-1: 17b8c13d329539c9b6a856089c97cce70119b484 SHA-256: fe19985187be01f812bc1532221ea3e72f855fa11a3e06a89186b3dc2e815c48
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The presence of these links suggests an attempt to manipulate search engine results or redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://bearings-home.com/userfiles/file/44725936152.pdf
    • http://puisan.ru/uploads/file/vafofudulaxuwezopetojujo.pdf
    • http://antropolog.ru/userfiles/file/4148115262.pdf
    • http://semanbio.com/upload/files/goxaziroza.pdf
    • http://ccforum.kr/uploads/file/1631277871.pdf
    • http://newworldss.com/uploads/file/zewuvizad.pdf
    • http://influences-vegetales.eu/assets/Image/files/momedolidojalalogagu.pdf
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/mawowulipuraxof.pdf
    • http://gamax-moto.cz/data/dokumenty/xuribobaxapi.pdf
    • http://creationart.hu/files/file/dasoves.pdf
    • https://universal4shipping.net/userfiles/file/68861399775.pdf
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/42725467280.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/h8qp4foh2q2picenulnadd8c2t/vibidigupisupobosewogalav.pdf
    • http://state-lithium.com/upload/files/vivefukovanoluzuw.pdf
    • http://kiuanai.com/userfiles/file/30712566651.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360ebe4ed85---16440287385.pdf
    • http://barudan.hk/UploadFile/file/20210908195135962.pdf
    • https://farmaciasacoor.com/site/upload/file/ditalafesolalimis.pdf
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/37224765777.pdf
    • http://mdbim.pl/ubezpiecz/obrazy/file/67048707537.pdf
    • http://fernandopelosini.it/userfiles/files/gijekabeweduxalorabebusaf.pdf
    • https://kisikana.hr/UserFiles/files/masovamelujod.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=class+8+grammar+worksheet
    • 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_off0000e21d.bin
a9d5997ecca134709c0f2490dd77574591971db6901d77c989914d76f195e429		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE21D 17248 bytes
font_01_sfnt_off00010e74.bin
3bc6e76b99c662895872572b9c04bc35e18e62489cf243cae24e89feec178a9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E74 10776 bytes
font_02_sfnt_off00012775.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12775 16792 bytes

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