Malicious PDF — malware analysis report

Static analysis result for SHA-256 56b3162418c11ec0…

MALICIOUS

PDF

73.7 KB Created: 2021-09-28 03:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f8c6adcf486922880912e645e69683af SHA-1: 57f263583b6eb8292e6e03e3a9ce4259dc86fc28 SHA-256: 56b3162418c11ec09aa31e9c9f626a322c4974494d30ffc2f8652251e1d9d2ba
126 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier returned a high probability of maliciousness. It contains numerous external URIs pointing to disposable domains, suggesting a link farm or redirection to malicious content. The PDF structure and embedded links indicate it's likely used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://krisoc.ru/uplcv?utm_term=video+buddy+free+fire+diamonds+apk PDF link annotation
    • https://tskrea.com/userfiles/file/purukisiralazalasodotomo.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/20171729005.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/90306000313.pdfIn PDF document text
    • https://cncunse.com/d/files/rugefux.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/84874037811.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/21140561569.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210917194450171.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c44768eadc---3279882686.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/6894922440.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/jukosen.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210911141130695.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/petuvolelaxobusufafo.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/8819158009.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/62859912742.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/43479734008.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/zugaxevexude.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/17103511490.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/17273635985.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/xodasanu.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-28/20210928065625504531.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/loroforuvefafagugix.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/xasuveg.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_off0000b765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB765 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7C 10932 bytes
SHA-256: 94505b41530d6d6f0d15aebaf217e0b9c0a9aabe0b167b830243bfa373092fa6
font_02_sfnt_off0000e898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE898 18348 bytes
SHA-256: 4b1ca84c8f4ec2f688631503c17958f41d6f53689bad5455e82c27019412cbc5

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