Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c8308ab3d41834…

MALICIOUS

PDF

85.2 KB Created: 2021-09-19 00:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9de43899727ac9f58b6f46a043a65054 SHA-1: b91ab6438ba58ede694a79e535ba145c883eb7fd SHA-256: a1c8308ab3d418347a7aebe2218cf9c22f8bc01017aef6c19a6f0be625809b12
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of a link farm strategy, suggesting an attempt to direct users to potentially harmful sites. The presence of 'utm_term' parameters in some URLs indicates a tracking or phishing lure, possibly related to popular games.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7659

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://infrive.ru/uplcv?utm_term=dream+league+soccer+2021+ronaldo PDF link annotation
    • https://esz.jp/img/editor/files/95482707122.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/73861546393.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/42523473396.pdfIn PDF document text
    • http://mdtrend.hu/files/file/71337850887.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/gulaganog.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/migur.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/72514049214.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202109171558410152.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/dexokizasajejodizenu.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/zabejasesodapusirizara.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/nelaxoduw.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/rigoduvot.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/divikomadevupifi.pdfIn PDF document text
    • http://tochalco.com/uploads/files/vadexom.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/37023621972.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/dulatuxidisudogedi.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/wosotadunula.pdfIn PDF document text
    • http://dejede.com/userfiles/file/wenosolejowekewozi.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/31509615292.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/35234672525.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210903001027560.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/54010424672.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/cc99920507e6e24e497f8100634f8e7d/79780520128.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/gasatisi.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/wigalinimimekozijapefuk.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/35215669495.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/86218676753.pdfIn 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_off0000ef5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001076c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076C 18256 bytes
SHA-256: 43d4cf6d456c59db37ea3e5687e60d992f645b4d52766bbde3794656a9371eb0
font_02_sfnt_off00013701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13701 10920 bytes
SHA-256: 1689363b65040d7c59463c55870ce1002310ece8901c181dc6ebe04847fb3a1a

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