Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef580a8ac094a7e7…

MALICIOUS

PDF

76.5 KB Created: 2021-09-29 10:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5c19ada6655e4326176d7778bf025ea1 SHA-1: 00b5a3a83182481410ec65ec6f67a542eba0c6c3 SHA-256: ef580a8ac094a7e7ae4c92de5099b72e1658d05612b033a1817ffdbfdf30e00e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains, suggesting a phishing or link-farming operation. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is part of a link farm on disposable hosting. While no scripts were explicitly extracted, the presence of external URIs and the overall structure strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://catamma.ru/uplcv?utm_term=ola+tv+11+apk+download PDF link annotation
    • https://bouveau-consulting.com/userfiles/file/78108960718.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/segifusawoleridebivunenul.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/varusorasipirevup.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/70232889419.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/61746112303.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/zadanoxesiworebujuzusimo.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/64901778529.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/pinovakinedilavakixiretag.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/fujifebakerapam.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/19914060785.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/88491329095.pdfIn PDF document text
    • http://leguido.net/files/mutajeronefawipowuzed.pdfIn PDF document text
    • http://hujiangsy.com/upload/files/48473601254.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/cdf19df86977e2f0677d37bafb9dfd27/tusesiv.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/tatubufep.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/fepuramusobasubijezejan.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/35829306165.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/xunogawadujova.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/remisinan.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/jawafipafoduvo.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/36121554643.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/63032479855.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109050018284148.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/68309081410.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_off0000c0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A6 19572 bytes
SHA-256: aa1731da1cd9e694c278a41a0821cf50b14c4c8b46d8a87902c22af980362a52
font_01_sfnt_off0000f38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38A 10216 bytes
SHA-256: cd9d0af477560e117c7538c734edde229576b071ec8d3b224558c57911877a61
font_02_sfnt_off00010ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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