Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fe944e474a389dc…

MALICIOUS

PDF

85.1 KB Created: 2021-09-18 21:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 82696ed6ddc8d2c9e19227ff5ac74880 SHA-1: a0d2ac7e3f1db41868bc3b1b6003984db8322112 SHA-256: 1fe944e474a389dce0a2b0a91474959cbb1f1948dbd25287282e344536908ffb
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 domains and are structured as link farms, indicating a likely attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://thuephotocopytaihanoi.com/upload/files/12675499509.pdf In PDF document text
    • http://midospa.com/upload/files/gexizimonirulexibisubuwa.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/zolepubowobekivabegujutem.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/wiridixubal.pdfIn PDF document text
    • https://micsys.in/userfiles/file/62198338532.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae80b77eb0---99676842058.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/siwotebe.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/gefafafeledijejavitujef.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210908190136.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/78644199812.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/mubepede.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/ja1flmml4qe4ih0h9u2312pcu7/17784261178.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/58028784088.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/81128415017.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/36195743534.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/bozepezuvinigubu.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/27404706567.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/lafajakejulebexukaxedone.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/82184335267.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/83739367408.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/zokafaxaboloturejumo.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/24371779792.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=dhruva+natchathiram+full+movie+123moviesPDF link annotation
    • 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_off0000e575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE575 18104 bytes
SHA-256: 19bd143035d54fb3a7ce397f1701769f7ae659dc8b4ed9d5cf56644121730b41
font_01_sfnt_off000114d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D7 11112 bytes
SHA-256: f5d319d0dc22405662cf628596b509cd5d88b800cda2188c30a92c589d8dea41
font_02_sfnt_off00012ec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1