Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8a4d2c49abd57b7…

MALICIOUS

PDF

79.4 KB Created: 2021-03-29 14:23:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba4078a1c12343470c71d874be653531 SHA-1: e6701096ee29c0d747e847b428ed7c35be40723e SHA-256: b8a4d2c49abd57b7e250aa69a6e69e160c806f7a507120d42d9e1f6bbf6bae53
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the presence of numerous external URLs suggests the document is designed to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://bologen.ru/award?keyword=dolce+amore+full+story+pdf
    • http://ouily.xyz/how_long_steak_on_george_foreman_grill1syks.pdf
    • https://varivupe.weebly.com/uploads/1/3/4/4/134480773/1963246.pdf
    • https://supavutoni.weebly.com/uploads/1/3/4/7/134713891/5fa1c.pdf
    • http://ig-soft-team.com/49825387795cftcy.pdf
    • https://buliduxefexefux.weebly.com/uploads/1/3/1/6/131636978/d55e258b.pdf
    • https://xikewipevugid.weebly.com/uploads/1/3/1/3/131383679/56e2faa.pdf
    • https://limuvowefegepud.weebly.com/uploads/1/3/4/5/134509231/jifekidesoxixo.pdf
    • http://emirofficialzm.com/41730704184phg4a.pdf
    • https://werukubafufu.weebly.com/uploads/1/3/4/0/134000234/japusugemujosoli.pdf
    • https://cdn.sqhk.co/kofisosiz/vjcAajf/13832017232.pdf
    • https://tavebesu.weebly.com/uploads/1/3/1/3/131381332/369dda4903e15.pdf
    • https://mogudigadoto.weebly.com/uploads/1/3/2/6/132695399/8260881.pdf
    • https://cdn.sqhk.co/joxudilabi/5ghzdhg/new_movies_mp4_2019.pdf
    • https://fapuwokezisojo.weebly.com/uploads/1/3/1/4/131453853/bulebofusebegewara.pdf
    • https://cdn.sqhk.co/dinokafoxume/hJOicM6/40267569237.pdf
    • https://wukubikowifetu.weebly.com/uploads/1/3/4/7/134725801/mexerubuxapi-puxapa.pdf
    • https://cdn.sqhk.co/ketofebem/TgMjeYD/68599229077.pdf
    • http://topdouche.xyz/unit_stoichiometry_mole_mole_calculations_worksheet_1_answer_keyv8cwy.pdf
    • http://faceit.su/mukekajotepadonarunorunq2kwv.pdf
    • https://cdn.sqhk.co/zobunifi/jggvgdp/wotused.pdf
    • https://mivagadak.weebly.com/uploads/1/3/4/5/134599435/77c65.pdf
    • https://valabokewem.weebly.com/uploads/1/3/5/3/135311070/5830621.pdf
    • https://cdn.sqhk.co/rufosopufu/njh4Yqc/fuleleda.pdf
    • https://dururamud.weebly.com/uploads/1/3/4/8/134846475/mokuzorotukutur-pesoletonodex.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000f917.bin
0c80ae7774c4a927def9460a5d9bab9d968c0dbff4dbcb4474597f71d80473eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF917 5404 bytes
font_01_sfnt_off00010b73.bin
8f23905d73b118aee40aa85364c6a43397db4ce3a8025eb9581aebc9cfa06fae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B73 10892 bytes

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