Malicious PDF — malware analysis report

Static analysis result for SHA-256 657b8915b9b156d6…

MALICIOUS

PDF

84.6 KB Created: 2021-09-15 15:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e83de073fd7e390b30f74658896d4b3d SHA-1: 84cb704faf7177d08c145cd37ebdac6b8471b17b SHA-256: 657b8915b9b156d6ba5b4c9ef6c4559b128c98c1228668db9f5b6e066a8dc506
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or increase the reach of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=data+structures+and+algorithms+exam+questions+and+answers+pdf PDF link annotation
    • http://studiobaliva.eu/userfiles/files/lesowuvibefubo.pdfIn PDF document text
    • https://pindimana.in/uploads/file/manijep.pdfIn PDF document text
    • https://baongochoa.com/upload/file/28252758106.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/36343718878.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c85f03c2708fca617e12dadee95ffe20/pizililukewodivox.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/61753384943.pdfIn PDF document text
    • https://tuvanthietke13-5.com/webroot/img/files/2463288281.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/lajorugotavojawad.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/87795070484.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/rirufajoxoba.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/83771238509.pdfIn PDF document text
    • http://artdental.hu/editor_up/zuzojosupasubox.pdfIn PDF document text
    • http://thevale.us/userimages/zalufewevokonomule.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/bufomuwepinivejar.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog/file/91994976002.pdfIn PDF document text
    • https://premium-house.uz/images/file/zilofugimitub.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138d2a830650---riliv.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/worubibulozuxisaj.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/gujevilikekejebuner.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/lunumuroni.pdfIn PDF document text
    • http://agama-rc.com/upload/files/16664274802.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/bisojisajiditolu.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210912045106302725.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/xudumazuzebiriveror.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_off0000e422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE422 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC34 17200 bytes
SHA-256: c02800838bd6e63eaf72e5abdc289e9e091d0f63ef7dd1432c58ffc986675a11
font_02_sfnt_off00012917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12917 11500 bytes
SHA-256: 2ed4b9f29fcd4cf4dd1e13f7586532f1575b28012bb69fdebc456faa6d33d492

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