Malicious PDF — malware analysis report

Static analysis result for SHA-256 36cdff09f018fa7d…

MALICIOUS

PDF

69.4 KB Created: 2021-09-12 00:31:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 44229bdc77b468e31312d81e593f6e31 SHA-1: 809b5fb64a3549f77dd49256a4c26223a91f3412 SHA-256: 36cdff09f018fa7dcd534d64aaf484fc768d14acc0d84c658be954c11cd94145
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many of which are hosted on disposable domains and utilize UTM parameters, indicating a phishing or link-farming scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used to redirect users to malicious websites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://crysiq.ru/uplcv?utm_term=super+mario+world+2+apk PDF link annotation
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdbaaa76d2---62287899510.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/49409119493.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/21ce1bfc404d47267f20e9c137b572c2/30959456213.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/kutafo.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/fazitupizebezovomilokizir.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/lukorarutobadanezimon.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/kodefadan.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/dojonekapoboxexisesupawi.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/tuzivazo.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/jumikaxerufavokatebo.pdfIn PDF document text
    • http://spharma.ua/files/file/59809743585.pdfIn PDF document text
    • https://aksusu.com/upload/files/25501330863.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/pixajozomo.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/67328210841.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/84250778499.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/28943525138.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210908191547.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/38138979141.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/pujerofo.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/zofevom.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021090713151479.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/mepixunotenusamaninav.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_off0000b0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0DF 10656 bytes
SHA-256: 2ae06ec3a196be8d67dea3e0294be7333aac87900f44d8c2c7d897efa54eec8c
font_01_sfnt_off0000c95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95A 15232 bytes
SHA-256: bb8bf2f294dce14f919fbb11dc635884ab95178da428f243a13d865ea6f2f35b
font_02_sfnt_off0000f00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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