Malicious PDF — malware analysis report

Static analysis result for SHA-256 c16e126985799255…

MALICIOUS

PDF

82.3 KB Created: 2021-09-18 05:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9545247de52f7895679513754d235eb8 SHA-1: 82462a8b43dc4b0110470e711a429ae720311924 SHA-256: c16e126985799255e6c22efd5a06f6d3f2929cdf0675572c75c1a48e2fbf2a07
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users to malicious sites. The embedded JavaScript is likely used to facilitate the redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://crysiq.ru/uplcv?utm_term=apk+cheat+ff+auto+headshot+2021+anti+banned PDF link annotation
    • http://fastcredit.ge/userfiles/file/vurofomesozofikivefizejup.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/dupuwuvuw.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/85548052235.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/15496693879.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/dedawelewowejiwejaseraber.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/21174072619.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/28944970140.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021091607294973499.pdfIn PDF document text
    • https://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/69724137817.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16136e82e0c96d---42000919376.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/busimojisezozemetigutigar.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/18034d101d4a40dd7f078126288d5863/zajinizebibuvuzunit.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/potimepejadevedosokoz.pdfIn PDF document text
    • http://manhtreminhduc.com/webroot/img/files/xadidobonuleje.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/fiwabibovokuke.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/jinotivaxirojale.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210904_104847.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/tebonujirunapivirifatut.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/92e4c7c7385d83f094babfaa8e4be45e/zemalenogakuno.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/febunirage.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/zereguse.pdfIn PDF document text
    • 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_off0000daaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAF 11176 bytes
SHA-256: 3b77ae44106e0e73fba3c6b1e48118f04802fe0b534f1840927a428b70214b1a
font_01_sfnt_off0000f4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B6 18008 bytes
SHA-256: 650dfd7999d5afd7e0a128e879639abe73667a041913284b96c1f12cd4a0e9fb
font_02_sfnt_off00012348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12348 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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