Malicious PDF — malware analysis report

Static analysis result for SHA-256 a20766223dea858e…

MALICIOUS

PDF

77.3 KB Created: 2021-04-01 23:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4683a498a7b7277d69a31ae161eaaf5c SHA-1: 1f1735001688414f230808447a5cf39eda54ba19 SHA-256: a20766223dea858e8c31b151a452bf0147ae48021b1bb95e145873b74e65d953
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to Weebly hosted PDFs, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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://jacksth.ru/strik?utm_term=who+was+the+greatest+warrior+in+history
    • https://fifekususelamib.weebly.com/uploads/1/3/5/3/135349053/7093900.pdf
    • https://fileduwefevara.weebly.com/uploads/1/3/4/3/134384607/fidumodi_dazenepo_fixowuk_kijelivosogifag.pdf
    • https://rawesare.weebly.com/uploads/1/3/3/9/133997405/lelamoramuzal.pdf
    • https://cdn.sqhk.co/xenudipu/jBf7Ghf/download_xtreme_drift_2_mod_apk_unlimited_money.pdf
    • https://cdn-cms.f-static.net/uploads/4416514/normal_6040291a17b2b.pdf
    • https://cdn-cms.f-static.net/uploads/4420431/normal_606189fda15f3.pdf
    • https://lolutisoxat.weebly.com/uploads/1/3/4/3/134315909/1418628.pdf
    • https://cdn.sqhk.co/xumifutave/Pgcijhd/luke_bryan_net_worth_2020_forbes.pdf
    • https://cdn.sqhk.co/dolafita/zwge7ri/wordscapes_level_8262.pdf
    • https://torosiwetub.weebly.com/uploads/1/3/5/3/135351177/c0b590c9350ab.pdf
    • https://cdn-cms.f-static.net/uploads/4459921/normal_604df0b4ede15.pdf
    • https://cdn.sqhk.co/wixefawoz/UMjdigf/endless_highways_performance_edition.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://40ba1f7a-6e91-49bb-bbb8-dfbb40a2bc60.filesusr.com/ugd/22bf55_65985b465b464f0fbc56a4d0cd53af28.pdf?index=true
    • http://terobuvopo.rf.gd/kabukadibumimatowisu.pdf
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_606f64d2d60040cd891fe39b8a531d93.pdf?index=true
    • http://wuwovedivaz.rf.gd/80249774907.pdf
    • https://ef9d90ca-5811-4a1c-810e-75bcfae60121.filesusr.com/ugd/a33af7_9eb61b585902414aafba79d3be33fbae.pdf?index=true
    • https://8b83d164-5e56-46cc-b941-48f48810ddf3.filesusr.com/ugd/76ce43_6b4e8ff65ea0480f8a344801281446c8.pdf?index=true
    • https://3c3713de-992c-4571-92b4-00afcb8cb2c1.filesusr.com/ugd/9dbdb2_dc0743abeff648eeb18d9f07d76308ba.pdf?index=true
    • https://dacf5b84-f80e-4bd8-bb7f-22aad20a1cd8.filesusr.com/ugd/285be4_5eac391183cf4143a8879e4cebd99251.pdf?index=true
    • https://f238abdf-92e3-4651-90df-65b6e8a648d9.filesusr.com/ugd/99965f_19b695fe8bf749a198ab2ff94c2f3501.pdf?index=true
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_b7b3544a980d428e9f616c9dc426e4d8.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_off0000f1dc.bin
2fa16dad812684a4b2c51a319f7f2bd435fa03cf196c7c16be7bca4acf0f9a12		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DC 5120 bytes
font_01_sfnt_off00010362.bin
bce21cd4c17eba4570bf1ae247dea9a703fc1d0fe56bfdf04849175155e0f97f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10362 10948 bytes

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