Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7c1d0ba5fad5c2c…

MALICIOUS

PDF

84.2 KB Created: 2021-09-15 19:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a736eb4feeca0d61194c7a21dcf7c2f7 SHA-1: 4f268a73df0a129f0af692ed4342682d81265d0d SHA-256: d7c1d0ba5fad5c2cb861bf4d9038e4101aed81c820642aebf93342efb2846178
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous embedded URLs, with one heuristic specifically identifying a link farm on disposable hosting. The presence of a URL pointing to 'sm300159.agchost.com' suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://sm300159.agchost.com/userfiles/files/42371248981.pdf In PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/95899473544.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/50367692873.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/fisamogirimovux.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/nuziv.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/zagosogipavujisagusosu.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/37465435022.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/gibeliga.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614188a45f169---xudasixeponasuzut.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/8653667987.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/sowonubikifebigadeduko.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/ruvaposadasisemakum.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/ranadozibuzaw.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/wazevajokolonusobex.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/kadezalubozajabi.pdfIn PDF document text
    • http://alocainghien.com/uploads/userfiles/file/40756285935.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/kewiretanokugivefegenat.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/33919081867.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/jowinopa.pdfIn PDF document text
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/18687849975.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/43722611309.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/15155244263.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/kiburoxixivagakenuxore.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=pok%C3%A9mon+go%2B%2B+downloadPDF 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_off0000e1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BC 18740 bytes
SHA-256: a13980529158180faf167ace67067adc3ee74ad38a76d05eea94156b127788eb
font_01_sfnt_off00011234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11234 10332 bytes
SHA-256: 2ebced2339b5ea7c92c2563d73d48878e4d97db1a4344617fdb4175343563504
font_02_sfnt_off00012961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12961 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1