Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9fe275761a55fd0…

MALICIOUS

PDF

82.1 KB Created: 2021-09-16 18:25:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 83deb428f7e197e38a1b7ee667bf710c SHA-1: c219a1b4fabe8268f2def5bd4a4bd7d0c49fd5f7 SHA-256: c9fe275761a55fd0604ce141ca540eb96d1b86ccb3450b0acc21bb9e12cf83d6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, characteristic of a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high number of distinct hosts and a link farm structure, suggesting an attempt to distribute malicious content or phish credentials. No scripts were extracted, but the overall structure and heuristics point to a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://srldirect.com/ckfinder/userfiles/files/72278869458.pdf In PDF document text
    • https://eko-briketes.lv/userfiles/files/zuxurofutadugufod.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/pikefeguz.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/jerogusore.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/33404466419.pdfIn PDF document text
    • http://st03.it/userfiles/files/kidafe.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/161421a2333969---tumoxixu.pdfIn PDF document text
    • https://hgb.se/filer/file/4774575330.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/xorizoxej.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/12274106442.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109031102551994.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/12014886533.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/jatedagusexuraz.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/42744988015.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/wirakibidoxulelidefilo.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/natadu.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614290bb7ee5e---94977707456.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/18143687733.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/33145125154.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/69198609249.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/16571892706.pdfIn PDF document text
    • https://atiksigorta.com/files/62632000052.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/81993904843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=clownfish+soundboard+discordPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6D 18000 bytes
SHA-256: 00d0a53983259d31d0464ef3465a431359b6221a5935b01385fb748adc25bd14
font_01_sfnt_off00010a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12238 10700 bytes
SHA-256: aff46ef691aa8aafd45d8fd63297eea10eb854ad12127eb101b160bac6e9f361

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