Malicious PDF — malware analysis report

Static analysis result for SHA-256 f73487672480ad8e…

MALICIOUS

PDF

82.7 KB Created: 2021-09-20 21:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8e48ae5bd039ef88ce28e7fa56ca638c SHA-1: 05cb746f00607872a52f140642b6f9504d6fcf1e SHA-256: f73487672480ad8ef3da53b3d7cbb2e8624cdc65de50886c80dd26357980f2eb
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 or trojan variant. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism to distribute malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on potentially disposable hosting, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://archism.ru/uplcv?utm_term=friends+film+release+date PDF link annotation
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/vuzikopozukekudalasu.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/sutomisomidivapavedaket.pdfIn PDF document text
    • http://schturman.ru/files/files/xurigudalifiv.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/38085222149.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/57375904070.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/vaxomamejefomufexomekemew.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fac1e0f2e0---24366672564.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/zewopelefafefuja.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/pitewugupakivawan.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/82466429782.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/vukupexona.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/2996063190.pdfIn PDF document text
    • http://hjhchem.com/upload/files/xoxulewusej.pdfIn PDF document text
    • https://buyafranchise.org/files/files/dikupuje.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/99469747879.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/55781831131.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/modomigako.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/nafoneruwu.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/181825283350.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/10537435203.pdfIn PDF document text
    • http://castel.lu/userfiles/files/fimemuxuga.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/2b5ca0e23a5d7055ba41156764eb902b/kenomejuvop.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/54002449744.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/duxuseveniwotuvepa.pdfIn PDF document text
    • http://air-ned.com/uploads/files/bakataralakipepe.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/89119955322.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_off0000dd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF516 18456 bytes
SHA-256: cc0a77124f3d17e2ef093d8f29cc572bf3d400e4c7dacd0ab29b90fd5f8f67fa
font_02_sfnt_off0001253e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253E 10372 bytes
SHA-256: c8618710f957d829086698e50c08d8db3331bf049dd4b65cd8266a180bfba449