Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f680529f462310a…

MALICIOUS

PDF

72.0 KB Created: 2021-03-16 13:13:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d27071b62417dd9406d034b18be0d848 SHA-1: 19e689dbfef0d68c8b2d6beacd7084676a48e645 SHA-256: 3f680529f462310a72e497ee03ff69e882f0f89ed9d76fc4c713f44b5e32c4d4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://golowaki.ru/strik?utm_term=kenmore+90+series+dryer+motor+removal PDF link annotation
    • http://pujesuwidiw.22web.org/watobakoro.pdfIn PDF document text
    • https://cdn.sqhk.co/mogudekusab/dhfifuo/ted_cruz_height_ft.pdfIn PDF document text
    • http://dawajilimomod.iblogger.org/jebarabugexeka.pdfIn PDF document text
    • https://cdn.sqhk.co/vobipibomuk/iNSihtV/kavemafiguvuboxoligip.pdfIn PDF document text
    • http://xakojudanek.66ghz.com/tudubedodiz.pdfIn PDF document text
    • https://cdn.sqhk.co/febapaji/g7CkrWR/gadgets_360_shopping_review.pdfIn PDF document text
    • https://cdn.sqhk.co/xizefonuma/SlifidQ/11488825771.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fonovituten.rf.gd/77158559286.pdfIn PDF document text
    • http://vumupekosevi.rf.gd/80981289488.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/numpy_pandas_cheat_sheet.pdfIn PDF document text
    • http://lejokadedemixo.rf.gd/vorewobupiburiguz.pdfIn PDF document text
    • http://didajuna.rf.gd/xokozovovadilumebewo.pdfIn PDF document text
    • http://delomubabobuzu.epizy.com/jerojexetepusosutexiso.pdfIn PDF document text
    • http://xotomupifejiref.epizy.com/volvo_bm_500.pdfIn PDF document text
    • http://fukefuxatolu.epizy.com/pogezexafabeliligadedux.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/99734016321.pdfIn PDF document text
    • http://najudugofuk.rf.gd/pujajiwejuxupuwibumeri.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/age_of_empire_2_cheats.pdfIn PDF document text
    • http://farujage.epizy.com/mercury_outboard_service_melbourne.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/zuzuso.pdfIn PDF document text
    • http://noxifepa.rf.gd/hello_kitty_coloring_pages.pdfIn PDF document text
    • http://sogirujik.rf.gd/nijidomin.pdfIn PDF document text
    • http://kowotasube.epizy.com/9030360286.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF1 5400 bytes
SHA-256: 3e186970cb71cfe5a06baf22e5137b883c8c3d48d1ae55df677036261e3a0495
font_01_sfnt_off0000ef41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF41 10412 bytes
SHA-256: 8e42bf44da67479eee819f6d908a2da62b9f10e3e7c2bfbb01688d63e8429961

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