Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea4c98fcc9bccdb8…

MALICIOUS

PDF

78.1 KB Created: 2021-09-19 09:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f1333e0ec803dac172c50b35c1566133 SHA-1: d44ac57b5a29a4a127ff3597298ba499f1cd56ad SHA-256: ea4c98fcc9bccdb802c4043536292099d6749ed87db7a973756559596b064cb0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous external URLs are embedded, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://krisoc.ru/uplcv?utm_term=cpu+z+apk PDF link annotation
    • https://perfectsextherapy.com/public_html/userfiles/file/lavides.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/kamigovovifijukategamu.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/7429705411.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/28975365579.pdfIn PDF document text
    • http://keyday.ru/files/files/29188348034.pdfIn PDF document text
    • https://medtek.vn/storage/file/lukojaxaxos.pdfIn PDF document text
    • http://ltpbetel.ro/userfiles/file/20345680655.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/73672911329.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/rafuvibulisomajuvu.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/gijomigir.pdfIn PDF document text
    • http://askaudit.ru/price/66749149127.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/noxupam.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/jagojilakesidunexiveg.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/42033626998.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/jerunedimafutaduzuweri.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/fizuguguwinobibujafeke.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/36356544168.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/zuvegefijuzol.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/3717162082.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/vudadipiwaxoti.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/3e9d989806f25fc2b67878d778361768/89373757659.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/68359998374.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/30219334427.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_off0000cfa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA8 17972 bytes
SHA-256: 57c3595012e746faf1bc9dc0a9f0ec17755740dd6e08d8c44b00f582ceff9fdd
font_01_sfnt_off0000fde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F8 9668 bytes
SHA-256: 76affee4c020992a4ee341ea2034fadcf4e54fbc36bb0baa604efc0be30dfd75

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