Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fae183ecc7b7530…

MALICIOUS

PDF

82.8 KB Created: 2021-09-14 01:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 25fb32fe5f816ce0e0d1d0dfb04f3282 SHA-1: 5fe153fa4fbab3a11630f5c9ed50e3a666b5d6ed SHA-256: 5fae183ecc7b753002ccb273810924f11da69fed862f2b613c05bc31475b3dd7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of external links, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kibbkw.com/uploads/files/72923786751.pdf In PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/walelosesaxadedo.pdfIn PDF document text
    • https://interconformity.ro/images/file/vajuseb.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/50335545347.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/movigotulipotizafero.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/29931696602.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/31121386787.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/tufuxumos.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/92555287721.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/wuwamimoteni.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/momotodepuwatatoziz.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/86437278645.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/suwigazuzosabokujutu.pdfIn PDF document text
    • https://susta.vn/userfiles/file/60132283179.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/doxemoganozukibasedivuti.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/69656703135.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/zopuzulekenoruzozazosepot.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/pesogosixerewadenafarew.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/wesulapobujumisu.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/87845590893.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/kurataferafe.pdfIn PDF document text
    • https://hotelangela.hu/userfiles/file/4442476026.pdfIn PDF document text
    • https://superpart.com/files/78560421180.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/dotupukasafaletedudini.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=akinator+vip+apk+free+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE5 10548 bytes
SHA-256: fafad8125131d37bac714e905a78dfc8cadfe8286fcba08e25a67246ad350296
font_01_sfnt_off0000f81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81C 17468 bytes
SHA-256: 1e69693717cf35fdff265dd42acdd327f530a5e2cde72db2719236cdf565e40c
font_02_sfnt_off0001256c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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