Malicious PDF — malware analysis report

Static analysis result for SHA-256 25f33df4401a0bc8…

MALICIOUS

PDF

83.6 KB Created: 2021-09-11 14:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0d34b019f59b22ea11e25c5245f246ec SHA-1: 8d29d67a8836de7a7fa9babd9bdda6f31de6305a SHA-256: 25f33df4401a0bc8b52c3d967160964850949af0c08401b81e5d94f8a82d350a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file 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 a link farm, a common tactic for distributing malicious content or conducting phishing campaigns. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://nature-revive.org/files/file/fofutodewowimibivi.pdf In PDF document text
    • https://cplastik.eu/data/cms/file/98752667185.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/laloguxozarabuxanago.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/87396157686.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/88730411257.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/rolapusisifajubidipute.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/milog.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/11910344920.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/71169930706.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/48259936722.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/gafezulevegojoretejoxid.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/7234216389.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210906_232314.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/47055623285.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/rodegadugo.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210903123652286.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/29852932643.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/38267756747.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/tapofo.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613707d5d6d31---banibirirurek.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613012327ee68---99455991059.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/98547278905.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=gta+sa+graphics+mod+android+apkPDF link annotation
    • https://easyown.ddproperty.com/datas/files/sedajekazopajiri.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_off0000e0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D5 10912 bytes
SHA-256: 5e83d56a642703168a959b1d089cb12d0409e015626d23d77c98cfb72e608dc5
font_01_sfnt_off0000f9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D4 17932 bytes
SHA-256: aba56e5479186f551c23f8cae4ff9bd69439111ed080ebd519e8d5877c6c9fde

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