Malicious PDF — malware analysis report

Static analysis result for SHA-256 c84265d9b578722c…

MALICIOUS

PDF

78.9 KB Created: 2021-09-19 04:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a04a94b7820d7dbb71e5e8ced657a337 SHA-1: af55807e850afc85e5d1e5f8e60a55b1c3cf8f68 SHA-256: c84265d9b578722cae1aaab3255cfd3a7aeb8993797fa65910b056879b4bfff6
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded links pointing to various domains, suggesting a link farm or phishing lure. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating the document is designed to redirect users to potentially harmful sites. No scripts were extracted, but the structure and heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://zgic.ru/!upload/files/49091530627.pdf
    • http://motopujcovnateplice.cz/userfiles/file/52225409299.pdf
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/55358655123.pdf
    • http://staceyasp.com/UserFiles/file/veperidijisej.pdf
    • http://elrey-uslugi.ru/media/file/ziragemiwafubilugemom.pdf
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/wijetetajelanimagadinever.pdf
    • http://jmk.kr/ckfinder/userfiles/files/15144250008.pdf
    • https://scavilecis.it/userfiles/file/batugatav.pdf
    • http://thegioichuyendong.info/app/webroot/upload/files/63574015900.pdf
    • http://bangladeshceramicsociety.com/uploads/editor/files/42097771885.pdf
    • http://noithatachau.vn/webroot/img/files/gotovanaxejaxox.pdf
    • http://studiopassarotti.it/userfiles/files/56789643305.pdf
    • http://devison-matras.com/upload/file/zosukaniji.pdf
    • http://asbu.net/uploads/FCK_files/file/93513843909.pdf
    • http://mygotour.com/FileData/ckfinder/files/20210911_43A674488C4747B8.pdf
    • https://cauthinh.com/luutru/files/wezegigozodusabigatoguv.pdf
    • http://oldmotorsclub.com/files/file/ponesipojokawadano.pdf
    • https://nhahangphongcanh.com/uploads/files/bikik.pdf
    • https://bya-ingenieria.com/ckfinder/userfiles/files/41046729511.pdf
    • http://viswinkelindex.nl/images/uploads/83825176314.pdf
    • http://madmojo.com/fckupload/file/dekewinatogimomarabixa.pdf
    • https://davnosti.ru/upload/63935408160.pdf
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/kesepi.pdf
    • https://ietc-oman.com/userfiles/files/97442206908.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=screenshot+setting+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d12c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD12C 16792 bytes
font_01_sfnt_off0000e93e.bin
5b6631089c2a90a0fdd9e406800480790e79868edc143be4903a92ea6a1e28cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE93E 17328 bytes
font_02_sfnt_off0001164a.bin
247cb3cf2ae7a5f48f8141c6a49dce35e7693f290bf8c934031b67d664113375		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1164A 10676 bytes

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