Malicious PDF — malware analysis report

Static analysis result for SHA-256 0815b6e21b793a5b…

MALICIOUS

PDF

73.2 KB Created: 2021-09-17 21:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c7e57b25d033397cf8375835250c9e5 SHA-1: 0f54633863490c870f34dcb83da3887fb4030456 SHA-256: 0815b6e21b793a5ba1656e3da276a0350c2549950c5d5f5b56bf639bd61a3153
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URIs, with several pointing to suspicious domains and one directly to an IP address. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a large number of links on disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://nomylo.ru/uplcv?utm_term=best+file+management+app+for+android
    • http://studioarchperissinotto.eu/userfiles/files/majejoro.pdf
    • https://zaindu.drogomedia.com/files/galeria/files/daruwejobipexadewuzo.pdf
    • http://jsdarvin.com/files/88987122356.pdf
    • http://webbuilders.com/files/file/18945512607.pdf
    • http://appinaris.net/ckfinder/userfiles/publics/files/59974795030.pdf
    • https://iword.de/userfiles/file/mewek.pdf
    • https://pmms-online.com/assets/file/puriwolipi.pdf
    • https://www.gico.ge/ckfinder/userfiles/files/47793679738.pdf
    • http://www.pvvc.cz/files/26400360805.pdf
    • https://tonerihned.cz/userfiles/file/sozewef.pdf
    • http://laarakkers.com/ckfinder/userfiles/files/1839376469.pdf
    • https://hamasataccessories.com/userfiles/files/kibevebonesufolinakoraf.pdf
    • https://pharma-tools.pl/galeria/file/safisobefukuk.pdf
    • http://unixsensor.com/uploads/files/202109051223009029.pdf
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/13184572810.pdf
    • http://revize-elektro.info/UserFiles/File/vufiludapo.pdf
    • https://hamzakocakoglu.com/userfiles/file/91324843796.pdf
    • https://mamadona.ru/ckfinder/userfiles/files/gafovameviluw.pdf
    • http://musikpark-live.de/userfiles/file/24392574114.pdf
    • http://zoekidsworld.com/userfiles/file/noguwup.pdf
    • https://getadoc.in/ckfinder/userfiles/files/ravewutinaperewirino.pdf
    • https://hung168.tw/UserFiles/files/85788673231.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef58d3960b---31837572335.pdf
    • http://naviway.su/upload/files/30125210637.pdf
    • http://bburago.info/admin/fckeditor/userfiles/file/21336263094.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161442988b554c---jejegonifazubarevuzek.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_off0000bc1e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC1E 16792 bytes
font_01_sfnt_off0000d435.bin
a97cd1ed40b52238e49bb2aba08c4d48dfe5cff28a709b8b7be18279a6c09688		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD435 10892 bytes
font_02_sfnt_off0000ed25.bin
8044f88d66bb5b4981b6dab5f0d263bbc7701a32a222ac50e53f37de66c1855c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED25 16212 bytes

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