Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea57d22dc5f578a…

MALICIOUS

PDF

71.3 KB Created: 2021-09-30 15:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0874068fe8ba0ac4d047c2e3032adb71 SHA-1: e35f6624024157d3d7e97268c6fdca204b6be150 SHA-256: 8ea57d22dc5f578a0963a961a5f3b5d56627e41a2b79167b51b6fb11233dfd8a
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous embedded URLs pointing to other PDF files hosted on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to distribute malicious content or phish for information. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but reinforcing the suspicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ferien-in-zahren.de/images/file/82690349868.pdf
    • https://keluargamimpi2.com/contents/files/8082404363.pdf
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/beler.pdf
    • https://www.nstoplana.rs/ckfinder/userfiles/files/pomodujutepakuw.pdf
    • http://cutskytools.com/d/files/70283815671.pdf
    • https://heks-tech.com/app/webroot/userfiles/files/wosasefapasovedid.pdf
    • http://yuhao-tech.com/userfiles/file/nuwenola.pdf
    • https://gkia.org/kingkong/userfiles/files/38029944428.pdf
    • http://sithome.com/upfiles/file/20210904165049.pdf
    • https://nic-irq.com/userfiles/files/velosoruberorefarosugito.pdf
    • https://www.tristar-technology.com/ckfinder/userfiles/files/faxefarosidaset.pdf
    • https://episcopiaoradiei.ro/files/zefuno.pdf
    • http://joyearland.com/ckfinder/userfiles/files/karamo.pdf
    • https://smgbid.com/ckfinder_userfiles/files/bodulemog.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/3i5rvld57cf4pvvu7udjvecd6d/36709798539.pdf
    • http://svsteinfurth.de/radsportfiles/file/32922221562.pdf
    • http://immobiliareborghi.com/userfiles/files/47621567780.pdf
    • https://kvzriu.org/images/file/xuxofupanatuvuwuvamowepox.pdf
    • http://www.tobywells.org/media/fckdir/file/45757926092.pdf
    • http://sbcnepal.com/images/file/lajirax.pdf
    • http://georgekoldun.com/var/upload/file/novex.pdf
    • https://j26clean.com/upload/files/votiduzexelowuwefi.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/36eccceb876b3309758d386cc532b50f/64943237273.pdf
    • https://e-ssuances.com/ckfinder/userfiles/files/7983454998.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=sonic+dash+hack+download
    • 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_off0000b42e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB42E 16792 bytes
font_01_sfnt_off0000cc45.bin
9b9be584a2e3fffdc6b73dd73e6c52ae3266e70a3d189ae7c88064138b4b1e29		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC45 10392 bytes
font_02_sfnt_off0000e3b3.bin
d2ebfd20c81509cea69f590420d4a20ce36f3e9ae4765349b9e53091f1da1a7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B3 17492 bytes

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