Malicious PDF — malware analysis report

Static analysis result for SHA-256 67640246c8140ca4…

MALICIOUS

PDF

71.1 KB Created: 2021-09-17 03:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3c6b39a4fdacfc9b6e9430c507eb3430 SHA-1: 52e8ebd55939cef36d9b46c897917fc46c0ece31 SHA-256: 67640246c8140ca4cc1c967a007ce7a0a1e9697c2209000bba1d62a628bd6f2e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=tina+napoleon+dynamite PDF link annotation
    • http://cesurmakina.com/userfiles/file/fokovajij.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/35890665514.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/77019092546.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/82794213515.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/pewizikuval.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/javupulodabi.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/23193250583.pdfIn PDF document text
    • http://hainfelderteich.at/72289313571.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/vifotafuxilowolirubum.pdfIn PDF document text
    • http://ave-france.com/pics/files/wesinoresuvutowaxibiwugux.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/zugotapevagotikito.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/guwun.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/53151817257.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/tirafufotominomimekuputis.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/gemufilataxesekamoso.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/35758991477.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/japitijorinelijoridoledo.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/79095112239.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/49fa40b3087c433f25e738fcd71e9e83/80865592696.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/23261099040.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_off0000b274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB274 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8B 10364 bytes
SHA-256: 6aae71cfcc07da3366cbc95fe8b90a721402829d8ffa1ecc7e7d898776314168
font_02_sfnt_off0000e1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E4 17372 bytes
SHA-256: b6fa851e29a101ae11ad59580f089937e40a6c564821b702b4de6cf2f85d22db

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