Malicious PDF — malware analysis report

Static analysis result for SHA-256 813d71b41472786a…

MALICIOUS

PDF

71.9 KB Created: 2021-03-31 13:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7928541fb7392c2dcbe809ca3aea48c4 SHA-1: fd0e85d3666fba58b97ef41eb24068c5933b3d3f SHA-256: 813d71b41472786aff0d22b38989187280946361a2e81f706129dbbd02dc89f1
126 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with at least one pointing to a suspicious domain ('golowaki.ru') that is likely used to host phishing content or distribute further malware. The document body, though heavily obfuscated, suggests a lure related to product searches or potentially fake product information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/wix?keyword=metra+70-1761+best+buy
    • https://cdn.sqhk.co/tofatuxurejo/4jfjbgh/21458500274.pdf
    • http://tulusujubige.mygamesonline.org/skf_bearing_puller.pdf
    • https://cdn.sqhk.co/veladaxuzeba/rQuibib/23478420990.pdf
    • https://cdn.sqhk.co/rorazelesu/O5liebc/35894715405.pdf
    • https://cdn.sqhk.co/pelonulu/cJgcl91/29470952521.pdf
    • https://cdn.sqhk.co/novigigexuxo/JDifBjg/vuwexov.pdf
    • https://cdn.sqhk.co/bitulore/ZjerjdL/my_boost_mobile_app_not_working.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_cb9abb179fa54d4993a5b0517f7b2952.pdf?index=true
    • https://s3.amazonaws.com/gotitibekovi/un_climate_report_2019_summary.pdf
    • http://sekuwomexapa.myartsonline.com/89777615762.pdf
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_19b44a976101471399b4a0f2101fefff.pdf?index=true
    • https://44879a12-c10a-431c-a98a-7de142752d0f.filesusr.com/ugd/bb4607_e96ec90977644ef4b4b2c6b139bd8dd7.pdf?index=true
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_d2f972fe2f6e47829b6d2e9bcd14a21c.pdf?index=true
    • http://supajiwa.myartsonline.com/data_mining_techniques.pdf
    • https://s3.amazonaws.com/resisuna/62641734295.pdf
    • https://s3.amazonaws.com/gogonof/root_a505f_u1_android_9_pie.pdf
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_a34cea27880740029bba6c79c9cace69.pdf?index=true
    • https://28ed73df-463f-41d7-bc87-4635118fd8e0.filesusr.com/ugd/74acc8_8bd78b2ee7d845dda671dfbe5cd7057f.pdf?index=true
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_cfcc8e9fe83440c09be4426362a5f9a4.pdf?index=true
    • https://42e65457-ec34-4553-8979-78b6e302f774.filesusr.com/ugd/f1976d_c711587095c543c1b7ff22424ff1c478.pdf?index=true
    • https://s3.amazonaws.com/topipovikapari/mijugesixejakuzotax.pdf
    • 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_off0000d93c.bin
1e8bc890692a753eda1ba7ac882e364d32f41518241b7bfe344c86721c661a5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD93C 5356 bytes
font_01_sfnt_off0000eb9b.bin
476a0b69ce60b76ad948cf12b2aa5733a5979dc817a9ad9b78661be34d358499		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9B 10904 bytes

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