Malicious PDF — malware analysis report

Static analysis result for SHA-256 4171f8828f9dfe57…

MALICIOUS

PDF

78.8 KB Created: 2021-09-18 16:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3cb4fadb0f8549ebfc3fbdbf4a6a8091 SHA-1: 8bc179b40664c300b547f7f7f50cee1d269f28cd SHA-256: 4171f8828f9dfe5746281dd081b0db2ed9500000de9d0336e99ca40c4497f8b2
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristic firings indicating malicious intent, including random URL links and being part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojan PDF. The embedded URLs likely lead to further malicious content or downloads, contributing to a phishing or malware distribution attack pattern.

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://irlanc.ru/uplcv?utm_term=grand+hotel+mania+mod+apk+unlimited+money+and+gems
    • http://yearbookplus.com/uploads/ckfinder/files/54226480157.pdf
    • http://oio.cn/uploadfiles/files/58161932339.pdf
    • http://exosushi.com/uploads/files/pimotinewexadir.pdf
    • http://studioingtassinari.eu/userfiles/files/91929803958.pdf
    • https://maconlux.lu/userfiles/files/notopinutiza.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/73403986778.pdf
    • http://scarpatti.com/files/4224975377.pdf
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/dasezenilusegojeli.pdf
    • http://paletydozahrady.cz/ckfinder/userfiles/files/nekefiporej.pdf
    • http://energywork.pl/userfiles/file/vuvofokukaxomijenuvipixe.pdf
    • http://life-worldwide.org/assets/uploads/files/17940232141.pdf
    • https://westhigienia.hu/editor_up/51724013067.pdf
    • https://debo-fit.be/userfiles/file///difamipiveka.pdf
    • http://acril.ru/ufiles/files/pukabefadebinetiwuritiwik.pdf
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/16151407052.pdf
    • http://kjphotocon.org/data/userfiles/files/kerefizazapifej.pdf
    • http://mylivediamondinventory.com/uploads/files/nolitotosutitapawuk.pdf
    • http://dkstores.gr/userfiles/file/temiwuvosapuvenovuj.pdf
    • https://www.zochrot.org/ckfinder/userfiles/files/lebiwoxupevokawemalav.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372e9e79cb3---diporelawa.pdf
    • https://jjcfurnituremaker.com/userfiles/files/15760046404.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_off0000ce1b.bin
c5f1b4355a82dd8358a5e4baf34dd50b251c0e57a1b564cf9a7cd60a790f7c59		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1B 11184 bytes
font_01_sfnt_off0000e7d9.bin
3f3821085ff09d9bc2d6b3a5c91dd7f96e48b484fdcc264ee47afe85a349c740		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D9 17696 bytes
font_02_sfnt_off000115c0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115C0 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.