Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ce43ffb90779592…

MALICIOUS

PDF

84.9 KB Created: 2021-10-13 19:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b3374c55a752a4c213c5e0fbba60532 SHA-1: bcb29cade751942d2ce6d19546f13ed1c32e3446 SHA-256: 7ce43ffb90779592345f7bfa86cceed2f1533279e764d85aa60fac2ed9b014c8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to suspicious domains, and is flagged as a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it is designed to exploit vulnerabilities or trick users into visiting malicious sites, likely for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://kochitaxirental.com/ckfinder/userfiles/files/talapotevaxenowawepapa.pdf
    • http://trips-in.com/ckupload/files/14085418852.pdf
    • https://idealist.ro/userfiles/file/88395086992.pdf
    • http://mtkshop.com/images/uploads/file/xeguxubak.pdf
    • http://bscsaoner.in/ckfinder/userfiles/files/webupisesazapitodon.pdf
    • https://next-engineering.com/userfiles/files/juxenukirudolodovezawi.pdf
    • http://firesecurity.sk/userfiles/file/rebelobagijat.pdf
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/59782034747.pdf
    • http://teplorium.su/userfiles/file/pijadinime.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341a703e236---13641664955.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418c1c72945---pinoninanigisovonafafufuk.pdf
    • http://abwingscolley.com/uploads/files/80246920764.pdf
    • http://noahmission.org/dataroom/file/gabitojulosinoxaro.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/pugiwegapolabawesipowesu.pdf
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/38030789201.pdf
    • http://patp1ryb.ru/media/file/dowobojokaloni.pdf
    • https://alzubidi.com/userfiles/files/pekuzul.pdf
    • http://daisytalavera.com/userfiles/files/dejamabumijixixusiro.pdf
    • http://michellenevinracing.com/FCKeditor/file/jutulubexezemegobewozuw.pdf
    • https://a-guskov.ru/uploads/files/12384057972.pdf
    • https://aprenda-atdi.com/uploads/files/murep.pdf
    • http://curvesncontours.com/userfiles/file/95701068534.pdf
    • http://gammatradings.com/userfiles/file/xuzenexofoteb.pdf
    • http://feedproxy.google.com/~r/MbOu/~3/D9plVHj2VOU/uplcv?utm_term=adobe+photoshop+styles+free+download+2020
    • 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_off0000e3c9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C9 16792 bytes
font_01_sfnt_off0000fbdb.bin
29870ab0135cde11e2fca2a773b804a5c74f3d951bd2de86d45668fe88f90df0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDB 18564 bytes
font_02_sfnt_off00012bc3.bin
373734a27337f90497ae1da4152d57bfc11275bafb72a1452c6589c466739bee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC3 11068 bytes

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