Malicious PDF — malware analysis report

Static analysis result for SHA-256 44652ce3711658c6…

MALICIOUS

PDF

80.1 KB Created: 2021-09-20 20:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6c9a1918ce68beb77896627070e7b5e5 SHA-1: fc3b704b2f6bddca068021fdc0cb167f34f652f3 SHA-256: 44652ce3711658c607f3b25c07c0f9cc697cf5b4accc6e1a3aeb982c2119ca1e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://weddingdove.tw/uploads/files/202109101745103208.pdf
    • http://bradzo-ep.com/uploads/files/fobezokedobo.pdf
    • http://taikenplan.jp/ckfinder/userfiles/files/64326803987.pdf
    • https://adikkedua.com/contents/files/vizimukifeteraromepisu.pdf
    • https://milorem-service.ru/userfiles/file/38267756747.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/19629e9d0bffdc0532dac8836cb8e136/texisero.pdf
    • http://ajisushionline.com/uploads/files/fogakixupomadawowizad.pdf
    • https://usgcambodia.com/userfiles/file/3440629140.pdf
    • https://etevent.itweald.com/uploads/files/6139c71d668d4.pdf
    • https://pgp-puh.hr/fck_media/file/34836362855.pdf
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/varuvemapave.pdf
    • http://dexgerm.com/data/file/userfiles/files/suveriw.pdf
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/wamigalip.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16137fbe619a04---dinumozewezazubitenufavi.pdf
    • https://alternativecarrepair.com/userfiles/file/kozapakutegibu.pdf
    • http://nationalherbo.com/userfiles/file/gilifejunereluja.pdf
    • https://lajovisena.com/gallery/file/kotogubiwefexuwov.pdf
    • https://vico-real-estate.com/ckfinder/userfiles/files/22012208042.pdf
    • https://ganport.pl/userfiles/file/94885812522.pdf
    • https://thai-airpark.com/ckfinder/userfiles/files/dototopinik.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16146c6e3173c2---83099267634.pdf
    • https://www.cascatai.com.br/ckfinder/userfiles/files/dukababof.pdf
    • https://amatnieks.com/pictures/image/37900329624.pdf
    • http://standartbio.com/fckfiles/file/73068289678.pdf
    • http://www.civilhospitalpalampur.in/img/uploads/files/mebikanutajapupe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=smart+iptv+for+android+tv
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d573.bin
e6cf0882b0d7bcf5249b812deed9982e7b97c400ab1a5ca5974f1acc0350d730		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD573 17552 bytes
font_01_sfnt_off000102bf.bin
a8a8fb373205d1954093c8a4f733fe09ae80b3628b2495694f0351533a06863f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102BF 10456 bytes
font_02_sfnt_off00011a77.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A77 16792 bytes

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