Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ae7e965332038c1…

MALICIOUS

PDF

93.6 KB Created: 2021-10-14 10:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 22e1a800c9010d623f77319701ca8dcf SHA-1: ed27f024982b4983211f165b1cbd27c13e94323d SHA-256: 5ae7e965332038c1024deb94f55f440cd89d602133b76524035e8a65fb0d1ef9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including ML and ClamAV, as malicious and a phishing/link farm. It contains numerous embedded URLs pointing to external, potentially malicious sites. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic specifically indicates the document's purpose is to host many links on disposable domains, a common tactic for distributing malware or conducting phishing campaigns.

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://coretry.ru/uplcv?utm_term=find+the+equation+of+a+line+with+one+point+and+slope PDF link annotation
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/62104459257.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/wiruwenikefaledab.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/vetomojagif.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/tilileferefazixaxixiz.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/movibalodebinol.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/kumetoxev.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/zararubifugeri.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/gulezim.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/55519600976.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/94235572670.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/64432206310.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/vexeb.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/midiroribamesijulebibib.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/54784302785.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/89087545557.pdfIn PDF document text
    • http://pi-consulting.ch/download/18804369765.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/83215254376.pdfIn PDF document text
    • http://iviltra.lt/images/files/kebojofopi.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/pinura.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/34348271376.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/nigevisivuwebe.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/37983651233.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10335 10804 bytes
SHA-256: 87452e3baf6affa281f1e82fe15d18c602bcaf66a58c9cbc7977c4ce2a23bad7
font_01_sfnt_off00011bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E8 19924 bytes
SHA-256: 26f1a2ced3635a2927e0c8560daadb8b8bdeece3293fd9ea58fd219b6f963e2a

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