Malicious PDF — malware analysis report

Static analysis result for SHA-256 95a3e42e9159e175…

MALICIOUS

PDF

81.5 KB Created: 2021-09-16 23:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3882fad1f0be5f3e77d29042326fbe47 SHA-1: 6846b927dcb1b03d3cfdd1855ea65d3edfcc6385 SHA-256: 95a3e42e9159e175df4e507ab84eaa05734b47bb244a89f4985cd410b94e7ae6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting an attempt to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://laborke.ru/uplcv?utm_term=smart+clone+apk PDF link annotation
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/b50138d9bbaecd7e9e384e66bea02326/jizupulusimir.pdfIn PDF document text
    • https://majubesar.net/contents/files/139389919.pdfIn PDF document text
    • https://carolinevlieghe.fr/images/file/mavujewumat.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/timowujubalawudagibevan.pdfIn PDF document text
    • https://o-dance.com/upload/files/63991984558.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/gafosuxavogewof.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/87425411350.pdfIn PDF document text
    • https://netkat.in/ckfinder/userfiles/files/lorim.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/41146532283.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/gutemobegip.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/lozifopepen.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161324798106e2---fepalavejafesagakax.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/vofuziz.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/lexeve.pdfIn PDF document text
    • http://metall-press.ru/files/45936792097.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/16125898217.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/53904270070.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/xiwonugabubeg.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/fukajozitobaf.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/69618060819.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/nemulepuzisonenojifunu.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/34832457116.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/64622908299.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_off0000d073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD073 10444 bytes
SHA-256: 190dcf9780b81e6a12395d588716e895554abf65afbc892735226f79522d06a0
font_01_sfnt_off0000e824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE824 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10036 21288 bytes
SHA-256: b5d49aabe45817e91abba7fa3f06fa5b34cbdf13e0fd89de1ea490c97d51c959

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