Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a9d007282bf7e2…

MALICIOUS

PDF

80.1 KB Created: 2021-09-10 02:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: efc25dad3b4648ce5a958aa2ebe3f47d SHA-1: 2d76b1a46ecfdc859c23542ebe000daf9489bd46 SHA-256: 91a9d007282bf7e2a72f411cb876f31bc1b7cc63b8f54777649700172f970311
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=play+store+redeem+code PDF link annotation
    • http://malopolskiszlakwinny.pl/upload/File/jetifigaxux.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/wolirenogored.pdfIn PDF document text
    • https://epiphanych.com/images/file/kaxujulabixutimelazosibo.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/zirizezinoxodozumisolirab.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/33280524765.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/35327954728.pdfIn PDF document text
    • https://tivicom.vn/upload/files/kogetugexatumeperu.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/jamigamam.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/79024221453.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/34977247940.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/38547234616.pdfIn PDF document text
    • https://lecachet.fr/docs/files/23679981453.pdfIn PDF document text
    • http://djpress.pl/Image/files/tivuzewenukix.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/7978316417.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/famija.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/50873019053.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/rewuvizu.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/14759515446.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/28924130196.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/xefazorinutixadun.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a770f98b75---mopuwaj.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/kizepadugupidalu.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/rapiputusivanitapipubew.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/zidutetogegarakar.pdfIn PDF document text
    • http://abworder.com/uploads/files/19944428984.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD515 10452 bytes
SHA-256: a83146d2ef6360ec8f6914ec77bd8f4909d2a739b82318b687d52d0c5e68b0f1
font_01_sfnt_off0000ecf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF6 17656 bytes
SHA-256: 245c17353addabec5d040a43fb3ef649987a4da0c302251571cb4c30926f2721
font_02_sfnt_off00011a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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