Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7e305cb0971896e…

MALICIOUS

PDF

71.0 KB Created: 2021-03-31 09:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3242ee18816a3a653544524267485de3 SHA-1: e4b7ff7b6838549c3762678bb1d2bf272e00d77e SHA-256: e7e305cb0971896e51cf0ce2ea1863a5c277a650a1cace0486c198cdee92adc9
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 of which are disguised as catalog entries, indicating a likely phishing or spam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically as a phishing or trojan delivery mechanism. While no scripts were explicitly extracted, the presence of numerous external links points towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/award?keyword=catalogo+jequiti+pdf+09+2020
    • http://vizilirudigub.getenjoyment.net/the_bone_collector_film_cast.pdf
    • https://cdn.sqhk.co/sifilefu/qZhhZih/nimowono.pdf
    • http://wubujonil.getenjoyment.net/citadel_how_to_paint_miniatures.pdf
    • http://zikevamakag.mygamesonline.org/balanitis_tratamiento_colombia.pdf
    • https://cdn.sqhk.co/suvezadamut/JkyHUjf/field_navigator_instructions.pdf
    • http://xomerisupudegop.medianewsonline.com/20253730560.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c6de0af5-2a4c-46da-924c-839bccb102c6.filesusr.com/ugd/5f1f0f_618d07673e8a4e9db1b3dc61e171517d.pdf?index=true
    • https://30dce114-5b7d-4ba4-aa44-e083516804ec.filesusr.com/ugd/7de0fd_ebb406c71949449eacfe2ebda326dbb9.pdf?index=true
    • https://s3.amazonaws.com/kulinisokakewi/nba_live_sport_streaming_apk.pdf
    • https://s3.amazonaws.com/davawina/esprit_anticonformiste_definition.pdf
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_0cb23d28da474823b188d1bb12566c2c.pdf?index=true
    • https://def26600-86c9-4442-a738-094ddf2992d1.filesusr.com/ugd/eb5a6a_eba3afe3214d4c588ef8969af581f7cb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bd893baf-0df1-4695-971e-1417fe611866/togewotawurasofosejukiv.pdf
    • https://uploads.strikinglycdn.com/files/b6a6de20-ca0a-4792-9359-cc1f1267f54a/how_to_trade_in_coinbase_pro.pdf
    • https://s3.amazonaws.com/wixatax/george_foreman_grill_steak_filet_mignon.pdf
    • https://s3.amazonaws.com/wazotojemov/zudamagubikosorawilaz.pdf
    • https://uploads.strikinglycdn.com/files/4279f005-bab6-4461-9350-c5b1fa25af81/dudusis.pdf
    • https://e0f910ba-f4aa-4d6b-87f6-24d78cda99ab.filesusr.com/ugd/cc15ef_545b4fc683234f54aed3009b628c5e75.pdf?index=true
    • https://s3.amazonaws.com/susonanezaj/android_9_device_encryption.pdf
    • https://s3.amazonaws.com/kubafezin/viking_gas_grill_repair_near_me.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_off0000d54b.bin
3b524837419275c9e38dd019cdb5ea000a129e583c4721ed28e7972ceb6fb15a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD54B 5472 bytes
font_01_sfnt_off0000e7fc.bin
65ad601231daa55f6479ea3499d8120fe1c008bc5d9f4d3069fa6e2df38d2f81		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FC 12096 bytes

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