Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ced98b69aa90bf5…

MALICIOUS

PDF

81.5 KB Created: 2021-09-16 12:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f5b9103bde6f07df27617fd2dca8d977 SHA-1: 436960bd52ef4d90105a7bd286f8463e0c47a382 SHA-256: 3ced98b69aa90bf57dcd3234061c66b75271126e7256aab13c4c15a55d34ed8b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which are part of link farms on disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and the overall structure indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://philabc.ru/uplcv?utm_term=asianet+mobile+tv+plus+apk
    • https://vietucmould.com/img-vietuc/files/67323362367.pdf
    • http://epmresearch.org/userfiles/files/mujalajaxan.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/97277c9c340bf9711666c1b7b6a07407/pokufiwatinetobowobefexip.pdf
    • https://fuoriscena.eu/file/dobopuj.pdf
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/nesasujubu.pdf
    • https://rajatotogroup4.com/contents/files/66374460981.pdf
    • http://www.hydro-tg.pro/upload/file/90301825817.pdf
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/40209274722.pdf
    • http://sushiyaslo.com/uploads/files/rometiravobemubokodijip.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/8458c443df40c4b6d7d0992bbb08222f/pazoloxolukozibiz.pdf
    • https://zhbiotech.com/CKEdit/upload/files/kinurinonesilaxutopeled.pdf
    • https://menu2uplus.com/images/file/savibisinelikevolezexod.pdf
    • https://costabravas.com/uploads/localidades/files/21361880854.pdf
    • http://designbyjoseph.com/uploads/File/48405199657.pdf
    • https://foursservices.com/nbloom/fckuploads/file/navezerukikededir.pdf
    • http://velapower.com/glwh/UploadFile/file/2021090414163873499.pdf
    • http://kuppersbusch.hu/userfiles/files/jesafivukesivaxika.pdf
    • http://jumpstart.mobi/ckfinder/userfiles/files/bokufe.pdf
    • http://jandebruijn.com/uploadimages/files/mufokibud.pdf
    • http://hanhthien.net/uploads/file/leruzukuk.pdf
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/41197227475.pdf
    • http://classicalgardenstatues.com/uplds/file/bilirabigupubo.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_off0000d8f0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F0 16792 bytes
font_01_sfnt_off0000f107.bin
bf11846ab2282fadb7299806d07a8edc8a6a8bc3e788568d5cf42e2cc196d50b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF107 10692 bytes
font_02_sfnt_off00010956.bin
83754779d2736ff98fce563204a8e94b846e0a8e45821cc5ccd76c48439144fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10956 18148 bytes

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