Malicious PDF — malware analysis report

Static analysis result for SHA-256 77edce7fa2ea82c3…

MALICIOUS

PDF

81.3 KB Created: 2021-09-16 11:34:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0fb8840e011c9a58eca74217d73d84cd SHA-1: b23ffcabf8f7569698692359952e297c587a473f SHA-256: 77edce7fa2ea82c3e625c5f1d375618de71d00da0ae704c14e77e5bc02936e71
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ketchas.ru/uplcv?utm_term=driving+simulator+2018+mod+apk PDF link annotation
    • https://cursosadistanciayonline.com/medios/files/susuk.pdfIn PDF document text
    • http://strap.sk/uploads/file/jigifono.pdfIn PDF document text
    • http://kco.su/userfiles/file/wiribuwetaforejuviruki.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/31935475298.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/guxixunujuvug.pdfIn PDF document text
    • http://chinatriage.com/ckfinder/userfiles/files/67915651713.pdfIn PDF document text
    • http://elpijisystem.com/file/55472041489.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/17541426959.pdfIn PDF document text
    • https://laps.pl/userfiles/file/73545114664.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/16241334247.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/lugewimalatodawaxenexo.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/vevogoferavezamuz.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/wiretipudibopixugekiw.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/pusutaniwapetopel.pdfIn PDF document text
    • http://border-collie.ru/sites/default/files/file/30197754191.pdfIn PDF document text
    • https://triosms.com/userfiles/file/47526465470.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/88427207663.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/10462731811.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/53028215008.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/dabilowowuxinivurev.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210910060508.pdfIn PDF document text
    • http://slsnn.ru/content/files/72185546492.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/zobizokasop.pdfIn PDF document text
    • https://junona.manyel.website/images/uploads/medium/gaxurigidoj.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_off0000d895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD895 17144 bytes
SHA-256: 523ec1c6d42a9eb759c705854ded12c09156e8774c522a27f3985735a62e763f
font_01_sfnt_off000104f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0D 11364 bytes
SHA-256: b753dfd7d2e9dbcc8c30a9708ee495f103513159aa24b086aaa8cfe3dfac2be1

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