Malicious PDF — malware analysis report

Static analysis result for SHA-256 513f5e1c841838a7…

MALICIOUS

PDF

90.5 KB Created: 2021-09-19 04:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2c78886fbda32ec8518cbe14a78fcbaa SHA-1: ab132fe3d60ef2340a4c751e2dfb2a9a6d32188a SHA-256: 513f5e1c841838a7bde65feec4c83898aa7728bca7bcedd0b86db1d107c9fcc0
146 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The presence of a raw IP address in a URI and a high ML score further indicate malicious intent. The ClamAV detection confirms this, flagging it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://helicopterleasingservices.com/userfiles/files/kaguz.pdf In PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/61807727683.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/70119283961.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/bosokat.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/zolopokafarufakerifa.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/89734074830.pdfIn PDF document text
    • https://suncables.co/images/file/3672187102.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/tofusi.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/14323620443.pdfIn PDF document text
    • http://nadafashionbelt.com/Uploads/file/rukataxeribitirukewuko.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/jozumisolafupedidi.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/2764288897.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/7465870655.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/kiwosukuniv.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/76347126812.pdfPDF link annotation
    • http://tvoirostov.ru/ckfinder/userfiles/files/67259587137.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/17987716026.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/71556416740.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/74784064628.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/xidapi.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/4231090603.pdfIn PDF document text
    • http://gugugroup.com/userfiles/sidazenugezonesubosigib.pdfIn PDF document text
    • http://ahknchem.com/upload/files/xagavipi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=dagger+2+dependency+injectionPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD258 10840 bytes
SHA-256: f8a1e02583ed08f196bf411e1c22e8982df1153bf31a75acb70943bbef8c56fe
font_01_sfnt_off0000eb4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4D 16288 bytes
SHA-256: a7a67940fc1158ea05c9cbd3d273844863aa6605b9200ad31037916afcf2c92c
font_02_sfnt_off00010159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10159 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001196b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196B 26460 bytes
SHA-256: e196b3fc169cb2e396eadb7617adf96ba3b1f3c2868eeaf8820af5c691c92820