Malicious PDF — malware analysis report

Static analysis result for SHA-256 17379dc2530ecc36…

MALICIOUS

PDF

68.0 KB Created: 2021-10-02 09:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 69d08eae88b1fe50272e2c376ece5f90 SHA-1: d356f92e7036944e0867bd35aff48e390875c70b SHA-256: 17379dc2530ecc36ac2efb3f0ac9442d0d6e3a75227a0f1d627738ddae3ef67e
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to suspicious PDF files on various domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for distributing malicious content or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelicanfinancialnetwork.com/ckfinder/userfiles/files/21431849677.pdf In PDF document text
    • http://energo-market.ru/sadm_files/damunonabovogajafoma.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/99598493505.pdfIn PDF document text
    • https://doctorchina168.com/upload/files/xawusuvasifojokuvakozake.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/dafavapa.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f707eabcba---68060933515.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/37736138774.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/fapamivaxibi.pdfIn PDF document text
    • http://lulanjina.net/upload/files/35388132912.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/27367951180.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/podozituzudil.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/wuxosomefimefaxigelav.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/mumiwino.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/46727100357.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/53961843630.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/kirubabexofajomugosu.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/satekexubagolejafitopu.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/59836918977.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=learn+english+through+story+upper+intermediate+levelPDF link annotation
    • 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_off0000a8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA8B7 15888 bytes
SHA-256: d8ecdabffb8943cd37871e07fa7635c71ffa39534c618cb2e339ef46f7dff040
font_01_sfnt_off0000d140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD140 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE957 11076 bytes
SHA-256: 121926a12d0591b2ade668a29af77570bc816a36fda79845b2821339d58f6174

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