Malicious PDF — malware analysis report

Static analysis result for SHA-256 65f10a81a08419fc…

MALICIOUS

PDF

91.5 KB Created: 2021-04-14 13:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e54ce8b84d5042f989f4ded9fe3ca4c2 SHA-1: 7b03fafb622c9653badf729246a22140eff671f1 SHA-256: 65f10a81a08419fc812c0f5d9b00aa1b383a79288085d63b18de9ffc047b4315
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged as malicious by multiple heuristics, including ClamAV and an ML classifier. It contains a large number of external links, with one suspicious URL pointing to 'resalured.ru'. The document body, though heavily obfuscated, suggests a lure related to 'operations manager performance goals examples'. The presence of numerous external links, particularly those flagged as a 'link farm', indicates a likely phishing or SEO abuse attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/strik?utm_term=operations+manager+performance+goals+examples
    • https://cdn-cms.f-static.net/uploads/4470836/normal_605f8284143c4.pdf
    • http://redita.fun/does_tracfone_have_a_mobile_hotspot65vfb.pdf
    • https://cdn-cms.f-static.net/uploads/4476939/normal_6035352514681.pdf
    • https://static.s123-cdn-static.com/uploads/4370088/normal_5ff6b0d392bbc.pdf
    • http://bitjoms.xyz/xoxapupipiwekud0zn8w.pdf
    • http://izzzaaa.space/step_3_worksheets04dq6.pdf
    • http://instapodarok.site/19675427809kdz2y.pdf
    • https://cdn-cms.f-static.net/uploads/4427085/normal_6052670790a4b.pdf
    • https://cdn-cms.f-static.net/uploads/4409095/normal_604db9b429ac1.pdf
    • http://italywom.space/vuwiglo6gs.pdf
    • http://differencecheats.net/67368229129p0800.pdf
    • http://fitnesspack.net/newofanazatowasfwpl.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://13fad4bf-7224-44b3-802b-16842e97d241.filesusr.com/ugd/b14664_2bcf46cb8a0b4513a049ecded1c63526.pdf?index=true
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_c147c2486f0a43748fd7cb4c07de73cc.pdf?index=true
    • https://4cd5eafb-d261-4666-a528-29b55b1676c1.filesusr.com/ugd/8dde66_246a7ca1ce1e4c818dc2c02c212c4a1d.pdf?index=true
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_ef026805eeb246f68df71a538813ad41.pdf?index=true
    • https://c2245d91-bd3f-4016-bed3-1da34bcfd793.filesusr.com/ugd/9a652e_895fddc1e2724827a4d397a66c2397c2.pdf?index=true
    • https://8b83d164-5e56-46cc-b941-48f48810ddf3.filesusr.com/ugd/76ce43_848e4c4e1c6f4aa092485dd9a8771987.pdf?index=true
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_f7b9b8e17ea442acb311650f7ce591f4.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_off00012736.bin
d3195bc5aa036d87396def9a414d7ac0b98024f3feeb5630d0e7f2b930371ad8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12736 5432 bytes
font_01_sfnt_off000139a0.bin
ee91f5934a6f1c2c207f73cc032c51c11b2e4e4ae33a3d4b4c4caea6e0be2900		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139A0 11436 bytes

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