Malicious PDF — malware analysis report

Static analysis result for SHA-256 810e7c2e9f4f7e45…

MALICIOUS

PDF

84.9 KB Created: 2021-03-14 22:45:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9baa724f8fe593a02969747cd1aa3e35 SHA-1: 26bed971cbca8fd1a7c47538410a96e68dd112d4 SHA-256: 810e7c2e9f4f7e456fe5934e79adfee03632b9392ddd0df7cea58fe9fde64021
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing trojan. It contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO manipulation tactic. The primary malicious URL identified is https://baarspo.ru/wix?keyword=the+thin+man+book+pdf, which likely serves as a lure or initial point of contact for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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
  • 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=the+thin+man+book+pdf
    • https://cdn.sqhk.co/duputokodoz/fha5ieq/turbo_dismount_full_game_free_download.pdf
    • https://static.s123-cdn-static.com/uploads/4421056/normal_5ff523e902631.pdf
    • https://cdn.sqhk.co/nabotogemobe/eja7NIl/55956252309.pdf
    • https://cdn.sqhk.co/bamebuxi/ajcggiw/josejeronigepos.pdf
    • https://cdn.sqhk.co/moxulofilose/hi4K3Jy/95900911620.pdf
    • https://cdn.sqhk.co/wituruxa/WAiddhi/nerako.pdf
    • https://cdn-cms.f-static.net/uploads/4390051/normal_5fd3afcaa30d1.pdf
    • https://cdn-cms.f-static.net/uploads/4484118/normal_60321039f3486.pdf
    • https://cdn.sqhk.co/pijajawopoji/b361sji/21268105883.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://144ece88-722e-4d59-a9d1-ae16887514c2.filesusr.com/ugd/48b17f_0cf10381dbc54f6f83d9ca8912966d7f.pdf?index=true
    • https://s3.amazonaws.com/babuxufarizuxur/tijubirumaditulapon.pdf
    • https://s3.amazonaws.com/wozoxub/xagotowezijitudalu.pdf
    • https://9d50af6f-dbf7-41ba-b854-83985329a12b.filesusr.com/ugd/33c377_3a83abc617534cbfacf5436cf93c9a85.pdf?index=true
    • https://s3.amazonaws.com/fusopoxipo/67037568292.pdf
    • https://s3.amazonaws.com/kujesulad/69282385601.pdf
    • https://s3.amazonaws.com/wazotojemov/miles_davis_milestones_sheet_music.pdf
    • https://s3.amazonaws.com/tolivajupeku/pedro_como_agua_para_chocolate_autor_biografia.pdf
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_c6cb0f32118743929479341337945cea.pdf?index=true
    • https://s3.amazonaws.com/rixevozajixezos/volkswagen_touareg_2012_brochure.pdf
    • https://s3.amazonaws.com/dezajok/dremel_4200_quit_working.pdf
    • https://1c684d3d-b1aa-4d58-8f8e-408f9cf37fac.filesusr.com/ugd/64d889_9fac581ca87142d1a0fa927b8863506d.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f989.bin
b5aaa04525a429a5eb3b25446cd73cfd4f98c77ed0a4bde76c5fb5280c61377f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF989 5128 bytes
font_01_sfnt_off00010acf.bin
c47352d38fd7a85ba6ee408575bd6589b9b60dc45e4f86f30b9f0581ec21b735		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACF 10728 bytes
font_02_sfnt_off00012fb4.bin
66cd902b334fc3a8a450b3b7a42ffe5031cba7a4412f01eb774febfebf38087b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB4 16116 bytes

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