Malicious PDF — malware analysis report

Static analysis result for SHA-256 c75ee56171646534…

MALICIOUS

PDF

72.8 KB Created: 2021-09-22 18:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6de1bbbd02d7c71db2a967bf0c5a34a5 SHA-1: 69416e265d7e2c3d65c86b3f1c5769b7a6400ed9 SHA-256: c75ee561716465347e5937fb42f463ae8b4d703ce4f6850e7bbdba9ef079e85e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URIs. The numerous extracted URLs, many pointing to PDF files on disposable hosting, suggest a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=redmi+note+9+pro+in+tamil PDF link annotation
    • https://nilsahost.com/calisma2/files/uploads/takoz.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/75621929734.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/95815445578.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/80907411053.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/besuvabe.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/40415003106.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/52766501540.pdfIn PDF document text
    • https://unaizahic.com/Files/files/famuporajapuken.pdfIn PDF document text
    • https://yasacompany.com/upload/files/tenolirixonofef.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614723c2295b6---97556535184.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/82340531285.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/44391800836.pdfIn PDF document text
    • http://st03.it/userfiles/files/21462190186.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/betagutin.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/retijadipafaxedirib.pdfIn PDF document text
    • http://teraval.cz/res/file/56527338068.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/89261548922.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021091601053273499.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/94037324916.pdfIn PDF document text
    • http://teraval.cz/res/file/vubaxixokijeson.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/93145399295.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/bazubajekazorukavefiram.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/45639382619.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/72283327247.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/xuzirekokowatekas.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_off0000b991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB991 10596 bytes
SHA-256: 3888fd2a787cc1eba2db1187e4683494e5ab7424082f1290ffa667e73962f2c0
font_01_sfnt_off0000d1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B6 17100 bytes
SHA-256: cd5ee7ae3743e384f8c212519c64b39de1a0e06a9ed1792df0ae778c87401b52
font_02_sfnt_off0000fd91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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