Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ad6515984f3f621…

MALICIOUS

PDF

69.4 KB Created: 2021-09-24 18:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a86504be38e19fcb68973396ce2005e SHA-1: 559dcc347453a5e23c17901ccbf7d33987052b8c SHA-256: 3ad6515984f3f621a12a244647713cbda3b7bb7e5d656f5e69c23f011f0cc635
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially malicious or unknown domains, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://wojczak.pl/userfiles/file/73966216117.pdf
    • http://koryosushi.com/uploads/files/32724003872.pdf
    • http://veterky.ru/ckfinder/userfiles/files/tuxiwugipa.pdf
    • https://prosaison.fr/userfiles/files/45566669325.pdf
    • http://brezov-gaj.si/uporabnik/file/94463199072.pdf
    • https://viceda.com/userfiles/file/10011521420.pdf
    • http://www.romanschatztruhe.de/img/files/simifixonifigijobaridi.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133e4aa26951---kidawoxojebu.pdf
    • http://klwas.org/userfiles/images/file/89706014800.pdf
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/danexu.pdf
    • https://daulte.com/ckfinder/userfiles/files/26017079488.pdf
    • http://uniradioweb.info/userfiles/file/3483037038.pdf
    • https://fceresources.com/ckfinder/userfiles/files/difigewesudafeduguwu.pdf
    • http://mrtowing.ca/Lawyers/userfiles/file/kojajitebogu.pdf
    • http://haiqi-machine.com/d/files/9446481882.pdf
    • https://booknowrentalimo.ch/userfiles/files/77127047896.pdf
    • http://first-group.kr/ckupload/files/bagetomepigilatomum.pdf
    • https://bayihoki99.com/contents/files/20435350751.pdf
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/durowobezete.pdf
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/zivudadiso.pdf
    • https://istanbulbalbir.com/upload/ckfinder/files/29883628802.pdf
    • https://strategie-forex.com/ckfinder/userfiles/files/fiwedotorapixidobokej.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=head+basketball+hack+apk
    • 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_off0000ad90.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD90 16792 bytes
font_01_sfnt_off0000c5a7.bin
754c13cc60bab218e548df54239ba3fae9bec7e2d2d4d475512cb2ac12327e5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A7 10420 bytes
font_02_sfnt_off0000dd25.bin
e89005698e1256c3063e81990c9ea4d2f18b20d9748e7eb3fd615dccec59e257		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD25 16904 bytes

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