Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf55ff66c522f61f…

MALICIOUS

PDF

83.3 KB Created: 2021-03-10 03:55:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2564b0b1cb67c54d2d8f62a21306890b SHA-1: 5d87a9bd7d38c9579f109b6c26c1332894ee002e SHA-256: cf55ff66c522f61f90e31964e9be5ff5678936afb10d79c4321b0c6820b3e39a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated and point to PDF files, suggesting a link farm for SEO manipulation or to host malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/wix?keyword=nakamichi+shockwafe+pro+7.1+review
    • http://vugadoxetufep.22web.org/22095088393.pdf
    • https://cdn.sqhk.co/vekokizijam/Oiaheha/podegumosovowa.pdf
    • https://tirepululavapiw.weebly.com/uploads/1/3/4/5/134576363/4599065.pdf
    • https://cdn.sqhk.co/mitejapeki/ibaigs7/nasurotiwek.pdf
    • https://cdn.sqhk.co/gobisurav/bgfoIha/chimparty_ps4_release_date.pdf
    • https://xekanowodupap.weebly.com/uploads/1/3/0/7/130739303/b31c7e.pdf
    • https://loxazubak.weebly.com/uploads/1/3/0/7/130739809/4533004.pdf
    • https://tuxedibuzi.weebly.com/uploads/1/3/5/3/135350702/8d46d84e8.pdf
    • https://nunipotewisi.weebly.com/uploads/1/3/4/8/134892443/b4f0c7f6c9c.pdf
    • https://cdn.sqhk.co/bularalunop/c8brhfD/xitokovegupogadimi.pdf
    • https://cdn.sqhk.co/menodotitit/jiYjdhe/real_theft_crime_gangster_city_uptodown.pdf
    • https://cdn.sqhk.co/wibononuve/ijB8igV/27456232872.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://aece7fbc-7072-4055-9cfa-29e0da41b620.filesusr.com/ugd/e878fd_2a9715ad706c469a8c1bc335100a466a.pdf?index=true
    • http://bipeturam.epizy.com/wilewewakasomakozidojov.pdf
    • http://misujeguseb.epizy.com/3163162381.pdf
    • http://gazisuwak.rf.gd/87044716827.pdf
    • https://uploads.strikinglycdn.com/files/c970ba57-00fa-4a59-b4a8-cee906516e54/95065896298.pdf
    • https://uploads.strikinglycdn.com/files/04500f3e-be86-44da-bd67-c67d2abb7d4f/42141099458.pdf
    • https://6db1e9a2-4282-4636-8d41-de07325ad911.filesusr.com/ugd/d97b38_d2364a2445954eb493f68ba6012f994f.pdf?index=true
    • https://dacf5b84-f80e-4bd8-bb7f-22aad20a1cd8.filesusr.com/ugd/285be4_2cf540c95dde465fa536c2d19dbcb95f.pdf?index=true
    • http://kesobikifa.epizy.com/vizikaxademikigokodejofew.pdf
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_ce74b394759d44e1831219f1c738da14.pdf?index=true
    • https://uploads.strikinglycdn.com/files/82fd95ef-d1f9-48ca-a254-52ba6ebeff24/wukev.pdf
    • https://0eb00d84-361a-45dc-b346-1af5c8eb785c.filesusr.com/ugd/d79848_1326bb3c0ab643b78a1aead58d23cb12.pdf?index=true
    • 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_off0001076d.bin
bc7a04c2007933bfd2e2594d46a419fbbc9ae2d94194636bf25ad420f2247247		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1076D 5572 bytes
font_01_sfnt_off00011a70.bin
7b238d6e20b09c7c1dd7babc9cc34971080d6579c733d620aad6a39992d595c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A70 10768 bytes

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