Malicious PDF — malware analysis report

Static analysis result for SHA-256 10c276208eec1cf3…

MALICIOUS

PDF

71.9 KB Created: 2021-03-20 20:00:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac878174243d388928298a9c53406e5c SHA-1: d438ce8bc228d2f9faae4f930f93f18e6d30f44c SHA-256: 10c276208eec1cf3af5ac671f1a94aeb100015bba2ca0c8d18c3360f85e64d27
176 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a domain associated with phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a lure to enable macros or editing suggests an attempt to trick the user into executing malicious content, likely to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://seumenha.ru/award?keyword=pdf+to+word+converter+freeware+mac+os
    • https://static.s123-cdn-static.com/uploads/4389801/normal_60015736b68ab.pdf
    • https://cdn-cms.f-static.net/uploads/4402247/normal_5fe60804e125e.pdf
    • https://static.s123-cdn-static.com/uploads/4470960/normal_6002addb2b8ed.pdf
    • https://static.s123-cdn-static.com/uploads/4365620/normal_60001440eb03d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/db94fbbf-5311-4385-a155-7377caab64b6/15674713083.pdf
    • https://f18b8dc1-3ce9-44bd-8712-01435d039869.filesusr.com/ugd/b97cba_3eae876e1cef467590089b90707ecb9a.pdf?index=true
    • https://s3.amazonaws.com/sajezife/como_averiguar_si_mi_imei_esta_reportado.pdf
    • https://s3.amazonaws.com/vixuwogetiv/comparing_fractions_year_6_worksheet.pdf
    • https://2a07c75e-e898-48ba-b326-4cccc82d0599.filesusr.com/ugd/ff154e_8491ffe46ec246a895a25d164c77432a.pdf?index=true
    • https://f770b3d7-c897-40e0-9323-5ad0abd91552.filesusr.com/ugd/1fa6dd_e57e49d78db44346a8b875192f09ee87.pdf?index=true
    • https://fed4949e-3809-4fc0-a28b-84c5d390f589.filesusr.com/ugd/94482e_8711c962a01847fcbaacb869289efaad.pdf?index=true
    • https://6478d21b-237c-41b5-add8-96d7b9819624.filesusr.com/ugd/c7ef1a_0a10aa0ec873461ea7d265e3a57e0b3d.pdf?index=true
    • https://a8a2d6b8-6248-42a0-90a4-e25e421c2e59.filesusr.com/ugd/f63f29_1f25307bc04949cbacef525317240c12.pdf?index=true
    • https://fa5d8e44-005d-4c05-925d-ba60cb7f5023.filesusr.com/ugd/121e37_cca3d30b86fc40f7ad05f021d1f3bc15.pdf?index=true
    • https://b304dada-1952-41b2-af44-d16a3232bb3f.filesusr.com/ugd/c19c34_87789eeec13a4794b017d22a6bc18971.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6a912c18-f235-4002-9755-d19360aff6a0/14467797653.pdf
    • https://eecb1da5-82b7-48ef-90e5-6a20895c07e7.filesusr.com/ugd/88a84f_9378a129e9b248ffadec6b7c6940d305.pdf?index=true
    • https://s3.amazonaws.com/lanaladu/big_green_egg_extra_large_table_cover.pdf
    • https://a50dbba5-e4fd-40cc-afa9-a45495a5accf.filesusr.com/ugd/7f929b_f0e16cadf3d441cca4e49e015097950b.pdf?index=true
    • https://535a9070-e28a-464b-adc5-c02ad08be00b.filesusr.com/ugd/9df9d6_f5d8f14195484ecbb25764d299ac2b37.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8a2bb003-3dc1-4a95-9bdf-dfc342cac85a/how_to_setup_old_apple_airport_express.pdf
    • https://4b523d79-2bc6-404f-8e52-0acae4d2cb03.filesusr.com/ugd/fe1b41_9d69f52133f44b4c949f9b0a1fba6051.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dae2.bin
53462b32ef5de11509c56e52a7817eb49cf0173acf2889ffcdd005bff77a14bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE2 5288 bytes
font_01_sfnt_off0000ece2.bin
49b2729afd4d017746bfa68a9b617cc1e21842bc398df537b6154f5f8586085d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECE2 11012 bytes

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