Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cad7e74cb8e829e…

MALICIOUS

PDF

80.2 KB Created: 2021-02-21 20:38:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 640d34538ea53d26b8ba3cdbfb6aae98 SHA-1: 910ed3e59924d462277d95dae8b78d99ac989488 SHA-256: 2cad7e74cb8e829e61a18bb02ba331d51ee4faad36c8af28ebe72a4578e23937
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://baarspo.ru/wix?keyword=don%2527t+starve+shipwrecked+beginners+guide PDF link annotation
    • https://fidimamafiw.weebly.com/uploads/1/3/4/6/134624465/9800620.pdfIn PDF document text
    • http://health2health.online/bomemuwevul7obc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401558/normal_5fe174f63fe4b.pdfIn PDF document text
    • http://livecopyrightverification.com/1992_dodge_dakota_parts_diagram127y0.pdfIn PDF document text
    • http://bathforlegs.xyz/maquina_de_coser_singer_316_g_manualwaav8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449395/normal_5fddb2a0362fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466659/normal_5ffc957114e7a.pdfIn PDF document text
    • http://regsenatvumen.website/69957869630v79zt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fokapikow/27580749212.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/leveling_guide_warrior_wotlk.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/caflisch_script_font.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/superannuation_application_form_nz.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/tax_bracket_changes_for_2020.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9D 5692 bytes
SHA-256: 1abb472841cc7bcdb2cd38fa643272186b8d2a22a4922a5706d17e99c19342c7
font_01_sfnt_off00011016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11016 10460 bytes
SHA-256: 5f3048e83256332c8d26daeac8a7715abb60b63136dc548851f427417bc4f12e

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