Malicious PDF — malware analysis report

Static analysis result for SHA-256 57b304d78b136d19…

MALICIOUS

PDF

71.4 KB Created: 2021-09-27 19:37:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34544bc85d03d40077a9898f2a1f957a SHA-1: 5c0ec9d3bfe3e7c9fdca0ff07219034f3f15c867 SHA-256: 57b304d78b136d1975469e0ed3332ce9a74e272496576f48e8ae8a36fa10b0de
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a large number of links hosted on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://pistant.ru/uplcv?utm_term=name+reactions+in+organic+chemistry+class+11+and+12+pdf
    • http://elitaliaweb.it/upload/file/72881814007.pdf
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210924_023312.pdf
    • https://oreopay57.com/ckfinder/userfiles/files/12825362681.pdf
    • http://autobedrijvenindex.nl/images/uploads/51832472324.pdf
    • http://autokaryszczecin.pl/userfiles/file/vepateju.pdf
    • http://ilkconstruction.com/Images/Media/files/21177431842.pdf
    • http://2b3la571ga-70p.com/contents/files/40807785671.pdf
    • https://kanalprofi.at/UserFiles/file/zirus.pdf
    • https://nidi.mk/ckfinder/userfiles/files/14191789339.pdf
    • http://tokyosushilohaus.com/uploads/files/vipajolufivagixorabuvogu.pdf
    • http://lindseyderence.com/userfiles/files/romusokopugodajuzagexu.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/32d8f1e936cc858b0264c55fd04fdf21/75622803258.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614b669d7235b---mujowumidowafivipitusal.pdf
    • https://hunde-katzen.at/soubory/32861171233.pdf
    • http://studiodebiaggi.eu/userfiles/files/gefunigigurolog.pdf
    • https://bimetoor.com/basefile/bimetoorir/files/69085095596.pdf
    • https://travelinnsuites.com/nbloom/fckuploads/file/jedegiminuv.pdf
    • http://markone-tools.com/upload/files/42529903577.pdf
    • http://hide-bo.com/img/tmp/file/27995389939.pdf
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/fonojuzuzo.pdf
    • https://tallerescarrion.com/uploads/file/43332621506.pdf
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/59106580704.pdf
    • http://davidhammerstein.org/userfiles/file/2003454317.pdf
    • 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_off0000b236.bin
a79b117414db7c87a87748ffcc14919ff7b5284a459b9f2dd72211e7b64f4498		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB236 11332 bytes
font_01_sfnt_off0000cc8f.bin
2293787068f1065e861693077c8fa42067d521343a7ce1a4828f6b2705be042f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8F 16976 bytes
font_02_sfnt_off0000f7d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D9 16792 bytes

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