Malicious PDF — malware analysis report

Static analysis result for SHA-256 5912d9efcc5598cc…

MALICIOUS

PDF

76.5 KB Created: 2021-09-18 14:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 77de414acebdbd6c405b42c2b38e784c SHA-1: f54eb64c91212203d992af61ad5ff5893ab8f90a SHA-256: 5912d9efcc5598cc257163367bbb0b2acfc14c4cf2c0a2ce2a78cdc35393d429
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, with one URL explicitly identified as part of a link farm. The document body is heavily obfuscated and unreadable, suggesting it is not intended for human consumption but rather to facilitate the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://cambridgekapurthala.com/damana/userfiles/file/99228653698.pdf In PDF document text
    • http://labsshop.com/d/files/xesubi.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16140e12f4be9f---vakapizivisuvanuxivid.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/vadosidurowugumafer.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/turimojurojejinemodakad.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/doxezavuzogagulirulebele.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/jelewig.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/16220836629.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/6818005281.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/32402968553.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/44014493995.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b388a6c2a7---moxuzezewa.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/kojixosonopomutaranoxudo.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/lagepududiwa.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/10846353966.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/kopipazefenarirotazazi.pdfIn PDF document text
    • http://asid.rw/userfiles/file/86325014375.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/fodolug.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/toketu.pdfIn PDF document text
    • http://hbaoge.com/upload/files/22623806813.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/pafunefipusedupomidole.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/punutev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=bot+auto+comment+instagramPDF 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_off0000c78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA1 10680 bytes
SHA-256: 33baf220dfac8be13dc0c8ca5c6613cb72070ed2fdbfaca5d8ba011ee2faf120
font_02_sfnt_off0000f829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF829 17064 bytes
SHA-256: b2cfedc81997ab2377e7d0456376a64590b8c434589f6c8e6879316cc39024f4

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