Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c78c5502c1bff4d…

MALICIOUS

PDF

86.9 KB Created: 2021-10-04 21:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d7402b0e54e41d015726fbed40b82f3f SHA-1: dce9a142747cf6460ba89456679ef2af10ed0194 SHA-256: 3c78c5502c1bff4d4263950e3ad58080554bd5bf3a3c4a47cc714404e093a4b2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://cameranichietsu.com/luutru/files/jutefov.pdf In PDF document text
    • https://thibiditrading.com/public/userupload/files/vasovugutofumarebugun.pdfIn PDF document text
    • http://farmina.ru/uploads/files/88825867285.pdfIn PDF document text
    • http://stormester.no/files/file/vezobimafanemevew.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/gapixutazuribujuwob.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/tofaxitudadez.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/gebawekopuluxa.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/busujuvilisetadopix.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/ladowevadodamowezatu.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/22869219569.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/puzumenusikedotubu.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/98380549489.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/padubonusilugomakolaxat.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161493281f29d1---majat.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/85522639379.pdfIn PDF document text
    • https://chptravel.ir/data/file/53260047409.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/13030529714.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/7535262927.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/welijisexadepebekorarupur.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/kigasavumitukesezuw.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/vujebag.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e08bf5c7f1---7260011800.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/fezekonilozokufamumukop.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/79333217722.pdfIn PDF document text
    • http://oookub.ru/upload/fckeditor/file/jazilokisibolunepenopez.pdfIn PDF document text
    • https://mklaassen.nl/images/file/munivid.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/ratumu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=baby+frilled+neck+lizardPDF 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_off0000ed74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED74 10544 bytes
SHA-256: 40bac739e8bd54069e4e0a98678870968d2ea130ad7c6ccd60361a9f53867855
font_01_sfnt_off0001059f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB1 18324 bytes
SHA-256: 94cc234c359c7a831cf03afe24dd336a7ac6dcafa5cd21ddc4791dd7633f1da4