Malicious PDF — malware analysis report

Static analysis result for SHA-256 64bdb5189b96fddb…

MALICIOUS

PDF

80.4 KB Created: 2021-09-19 05:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f9d9f9edbb7427660d84e1b2f02d8aa3 SHA-1: 10d35ca68d69753227ee718ce9d5cde7df39615f SHA-256: 64bdb5189b96fddb0ff7f6241e8c1b81a996e9abbf8ab80dba15cf9f6b48e515
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious actions within documents. This script is likely responsible for redirecting the user to a series of external URLs, forming a link farm hosted on disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://krisoc.ru/uplcv?utm_term=ppsspp+windows+10+64+bit+download
    • http://85560891.com/upfolder/e/files/20210909122254.pdf
    • https://peusch.lu/userfiles/files/puguxopunixusut.pdf
    • http://fonnepal.org/userfiles/file/40596497162.pdf
    • http://bestpokeya.com/uploads/files/kikolojibasigefi.pdf
    • https://vanphongphamhienluong.com/upload/files/vamuriditora.pdf
    • http://crabandclaw.com/uploads/files/nawepozijug.pdf
    • https://cristalensi.com/public/File/subefubilosi.pdf
    • http://belv.ru/userfiles/file/15968439461.pdf
    • https://asset-books.com/userfiles/file/66467316571.pdf
    • https://chetanaus.org/bheru/uploadfiles/file/26642123000.pdf
    • https://divinenine.net/userfiles/file/91286220759.pdf
    • https://dimensioninteractive.com/WYSIWYGImage/file/sevukaxolufunasodasiwo.pdf
    • http://cec-intl.ru/app/webroot/files/file/16766387427.pdf
    • http://hongphuc.vn/userfiles/file/nisevidajizodaxizezevim.pdf
    • http://architettipassarinmarzotto.com/userfiles/files/kagazajuk.pdf
    • https://cuatudongbinhduong.net/uploads/files/98820451643.pdf
    • http://farmaciacogliate.it/userfiles/files/pebagoso.pdf
    • https://flour.co.uk/ckfinder/userfiles/files/56929833721.pdf
    • https://dogathermalhotel.com/resimler/files/zojezekijolaf.pdf
    • http://kibbkw.com/uploads/files/tibizawuzosevetisobif.pdf
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/93468722366.pdf
    • http://think6.net/ckfinder/userfiles/files/20210913161317.pdf
    • http://rurisnet.org/images/file/pixunavuga.pdf
    • https://oldd.adventurenetbg.com/userfiles/file/51451973871.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_off0000d7f1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F1 16792 bytes
font_01_sfnt_off0000f003.bin
7c8044062a19d11a540a68cce17407bd88f3015f3bc13eb8d50fb3cc4768db67		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF003 16628 bytes
font_02_sfnt_off00011b08.bin
093008fd291178975565841fefc3cea961042dfb345d78140d63aa5afa554e1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B08 10800 bytes

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