Malicious PDF — malware analysis report

Static analysis result for SHA-256 a596516e6518bd1b…

MALICIOUS

PDF

78.9 KB Created: 2021-09-16 01:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2768b5a5ebce85d8f9340913253fe64f SHA-1: a4b4893b9ecc0ac6c058e45d1b888ab2fcc8158d SHA-256: a596516e6518bd1b88e603178ac88242a8eb9e60fdcfd573d29827521b90a341
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the overall detection as phishing indicates a likely spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://crysiq.ru/uplcv?utm_term=pixel+car+racer+mod+money
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614003aaea7a6---91515238077.pdf
    • https://geniodelweb.com/file/20899775574.pdf
    • http://stmarysharipad.com/userfiles/file/87864681034.pdf
    • https://pioneerlift.com/upfiles/editor/files/jumijan.pdf
    • https://fengshan-zhennangong.org/upload/ckfinder/files/sovivo.pdf
    • http://thinhhoanggia.vn/Images_upload/files/19979282451.pdf
    • http://ozdoby-betonowe21.pl/Upload/file/gofis.pdf
    • http://s-pack.kr/userfiles/file/20210915235611.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/6ee4fc5fd6da487b8b5a32c1da70e4df/41725443366.pdf
    • http://tnslib.net/userfiles/files/difebotakolupegemazifir.pdf
    • http://nhatrangpalace.vn/app/webroot/upload/files/53798908834.pdf
    • http://ageofwonders.buka.ru/sadm_files/42523107358.pdf
    • http://fthyhs.com/resource/docContentImg/file/2021-09-11/ac07bf68f5636afee0f66c3aec9261df.pdf
    • http://lsphc.com/userfiles/file///67526969910.pdf
    • http://jawarakreasi.com/file/26048941734.pdf
    • https://www.rougeindigo.com/ckfinder/userfiles/files/24103605078.pdf
    • http://www.neoneophytou.com/ckfinder/userfiles/files/76580128598.pdf
    • http://ahjygjg.com/upload_fck/file/2021-9-13/20210913192246498664.pdf
    • https://delaneyllc.com/ckfinder/userfiles/files/87659476962.pdf
    • http://think6.net/ckfinder/userfiles/files/20210903014650.pdf
    • http://logicamail.it/draft/media/98358381917.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_off0000c8fd.bin
187320c208ef1b333ffeaa07f0e6f6987d30c4440d4b40d2c9514cbbf596a939		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FD 20352 bytes
font_01_sfnt_off0000feae.bin
08d438c1f6437420d03ee779e08efcd001583083215f2e902260f42ac253b239		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAE 10480 bytes
font_02_sfnt_off00011679.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11679 16792 bytes

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