Malicious PDF — malware analysis report

Static analysis result for SHA-256 79fed662c97f756d…

MALICIOUS

PDF

85.3 KB Created: 2021-09-13 21:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 114aa1b8186f6961941e8f5fa395fd63 SHA-1: 270489864854837f550634fa727c14b03ee19b57 SHA-256: 79fed662c97f756d9d440708eab560bcba9955842ac02f8a7997c21a1a97a5f6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. 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 PDF structure and the presence of external links point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cructi.ru/uplcv?utm_term=how+to+put+a+sim+card+in+android PDF link annotation
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/78697432159.pdfIn PDF document text
    • http://air-ned.com/uploads/files/zokem.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/57685922782.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/161319bc7804a1---61010034699.pdfIn PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/062233364217.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/78580477697.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/fututevipiwegibedabisoma.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/nifesebabifa.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/68500466258.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/nodifesamuxusadavumim.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/tixiranapuwo.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/16568299394.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/feravovogam.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/65644864447.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/50805724473.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/kesatogumuv.pdfIn PDF document text
    • http://lagrupacio.cat/file/zutujapemejivirapozo.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/zenejopopomodomexunof.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/53274856309.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b48880b23a---dufimogalunikajimonamuben.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/52725484322.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/nemibidedijopusedenuwelax.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/jofafivinubobibabupi.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_off0000eb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001033a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033A 17056 bytes
SHA-256: 8986bbdbfe6ac30bb8c497eea9d3e2b4ad144359fc5621ceb310f7cd9192f78d
font_02_sfnt_off00012f07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F07 10676 bytes
SHA-256: 6b13f6d85e06de0a33993bcf3e77ea2e79495c535309118f76ab8244dfa6fc48

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