Malicious PDF — malware analysis report

Static analysis result for SHA-256 53b538519dc5dfe2…

MALICIOUS

PDF

75.4 KB Created: 2021-04-05 05:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2078b93584a43b4d1174bb5343d1d7b SHA-1: 8de57099fd2c0d68a998859f4fd826a6b8caf44a SHA-256: 53b538519dc5dfe23b790dde3de6023854153019f97bf45024f70d1b8e505e3e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document's structure is optimized for search engine visibility of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/award?keyword=ssc+analogy+questions+pdf
    • http://pijaparafagime.iblogger.org/razosuruvojos.pdf
    • http://lakufakatoj.iblogger.org/eyebrow_shape_guide.pdf
    • http://wovoradomumakil.medianewsonline.com/tomb_of_annihilation_anyflip.pdf
    • https://cdn.sqhk.co/jeforije/co7jihb/cute_drawings_for_boyfriend_easy.pdf
    • https://cdn.sqhk.co/xonivozew/jcMsDig/95087793593.pdf
    • http://bestita.space/logopazopitimibqgnrc.pdf
    • http://sizikigaraju.22web.org/armitron_pro_sport_watch_m1185a_manual.pdf
    • http://xeberok.getenjoyment.net/diwodenezusutemununuxojil.pdf
    • https://cdn.sqhk.co/tisezalave/nhdomgj/76016474802.pdf
    • http://logvoz.ru/list_of_core_values_printablenq8as.pdf
    • https://cdn.sqhk.co/vaminika/hcjggfi/buvijeleno.pdf
    • http://nopiwez.22web.org/dr_brown_sterilizer_how_much_water.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wojibikifi.myartsonline.com/autocad_lt_to_dwg.pdf
    • https://uploads.strikinglycdn.com/files/7b7e3683-67e5-47b1-9e41-05a43fbf422b/tarubolefikufajubetopa.pdf
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_ecfcf17406da4e9e9d84d3848d69e243.pdf?index=true
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_901719e4a19a4317849000f9bcf48b1b.pdf?index=true
    • https://2a085669-a8dc-40eb-b1d3-71ea9d660f60.filesusr.com/ugd/cafc24_ebe65102403a4507ad34265c76020f3d.pdf?index=true
    • http://bubejukajogimis.epizy.com/24956239913.pdf
    • https://uploads.strikinglycdn.com/files/e8193966-aaea-46f3-b6e8-172881919c65/dinogerozis.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e810.bin
7f4fc65191c68fd2e10a92470e94185abc26236de90101a82e746ee36d5710cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE810 5560 bytes
font_01_sfnt_off0000fb10.bin
35577be0aebd6b4b81dbe9baf9827fe8a6b0f3ea0a20e8e509c1efd96edc9ec8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB10 11112 bytes

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