Malicious PDF — malware analysis report

Static analysis result for SHA-256 e67c085f500af0b5…

MALICIOUS

PDF

74.6 KB Created: 2021-09-23 00:33:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 71435e183f53346234d47958c14ed773 SHA-1: 5d431755e7394a630afb522ffa9017fbd20fea07 SHA-256: e67c085f500af0b51bbf9e66026f082703b4a4f8a6ad590dc2255919cd5b254d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external domains, suggesting it functions as a link farm or a lure to phishing or malware download sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy of using many distinct, low-reputation hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://oniceh.ru/uplcv?utm_term=pixel+editor+apk
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/54064736975.pdf
    • http://infoegrafica.com/userfiles/files/97866009590.pdf
    • http://www.jindatunnel.com/up_files/file/53348960641.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/f600fd096cb202965a51f976e0b3803f/7242161385.pdf
    • http://oilspecchem.com/files/63606886708.pdf
    • http://gizmakina.com/depo/sayfaresim/file/77411922210.pdf
    • https://datawire.gr/files/files/xedorezik.pdf
    • http://neza.cz/UserFiles/File/32030398112.pdf
    • http://cybernet-ap.com/UserFiles/File/motolevozukoni.pdf
    • https://fnb-concepts.com/images/uploads/files/55821565484.pdf
    • http://ettorebelfioreliutaio.it/userfiles/files/gafosu.pdf
    • https://arvikabc.com/images/uploadedimages/file/lalep.pdf
    • http://kxqcgs.net/filespath/files/20210911233407.pdf
    • http://sz-nuoyi.com/Upload/file/2021091917334991847.pdf
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/98902152447.pdf
    • https://aakritidigitals.com/userfiles/files/72124794978.pdf
    • https://namkhoasaigon.vn/web/images/files/zosudilosi.pdf
    • http://tanriovermensucat.com/uploads/genel/files/70776068971.pdf
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/gomari.pdf
    • https://macjiboter.macjahisa.si/files/file/jameretevapejika.pdf
    • https://ohcsi.com/ckfinder/userfiles/files/fedefapuxaputenisajagexep.pdf
    • http://moderncarrent.com/user_img/files/bigowosekewuvuwenobuba.pdf
    • http://opersan.com/file/jejivupilapanirulujir.pdf
    • https://bankubezpieczen.pl/userfiles/file/92056824967.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://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_off0000c034.bin
32bcaa009af4acd809043b059a0d14a1dc7b9fba6b5e0788c214624cd6f531bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC034 10308 bytes
font_01_sfnt_off0000d78c.bin
bb26017dd5644aa46dda1a3a015fa23bb2cc33b2e2dcaf491ff482d53670ed8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD78C 17832 bytes
font_02_sfnt_off0001055c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1055C 16792 bytes

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