Malicious PDF — malware analysis report

Static analysis result for SHA-256 d771be8b21f4ea94…

MALICIOUS

PDF

77.0 KB Created: 2021-09-21 06:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 49244bb31f5b63bf73e4b8b17e52444b SHA-1: 14445ec0c2f3f9f1c0d6bf1a3639f427dcb46a30 SHA-256: d771be8b21f4ea94ff1908a0b8351854fd5e0617dcc2b04df85fe49a6ccb911e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The presence of PDF_URI and EMBEDDED_URL heuristics, along with the link farm detection, indicates the PDF's primary function is to redirect users to external, potentially malicious, content. No scripts were extracted, but the structure suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6826

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 http://ingmarcofaedi.com/userfiles/files/bizukawikizajutukixe.pdf In PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/kunufibatilepozezopumipu.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///tepemeril.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/wopiduw.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/wulamemexikananewubolun.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/62403817792.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210912071806849126.pdfIn PDF document text
    • http://fencefactoryny.com/userfiles/file/puwuzobaz.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/nigefilamizapedak.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021090801174173499.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/40899489566.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/berujivotupanufu.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/keremejizuvuvid.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/xexonawofavovade.pdfIn PDF document text
    • https://kakakmanis.com/contents/files/setev.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/xaliz.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/jozesekokaradakolibupixel.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138175b377f6---99314996487.pdfIn PDF document text
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/jiforubosezeva.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/xogina.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/9571685453.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/64092537324.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/zagebudevevitoxon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=viata+de+cartier+demoPDF link annotation
    • 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_off0000d5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B3 17880 bytes
SHA-256: 44a7dce17a027471c343f87b2b653f7cfd681f920ba151a6b27441dfa5096372
font_01_sfnt_off0001039e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB5 10184 bytes
SHA-256: 67efaf059520540f32eb09bf68bb4b77d0e11a44cd9e66d6c2c4c570047ae465

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