Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c6599198f0380e5…

MALICIOUS

PDF

78.3 KB Created: 2021-03-23 20:08:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 45c830da2aa7c0d01c6383c9ef84ecd7 SHA-1: d2cb9f7d9b3a69dd4235c0f1a9954ed3040c2198 SHA-256: 5c6599198f0380e56f550ea2f4635a810a2fe81f8dd27b6ee61f67173656f2b8
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to appear as search results or download locations. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing or trojan delivery. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maypoin.ru/wix?keyword=afterburn+aftershock+pdf+download
    • https://cdn.sqhk.co/soziwariru/f6rYjfu/55447866628.pdf
    • https://kelezisexuva.weebly.com/uploads/1/3/0/7/130739204/kixot.pdf
    • https://cdn.sqhk.co/zejejofe/bhfvclS/sowuwukal.pdf
    • https://cdn.sqhk.co/fisoxinizo/jfExjhx/little_foxes_spoil_the_vine_kjv_meaning.pdf
    • https://cdn.sqhk.co/kavatupopum/Wjhhfhi/candy_crush_soda_saga_not_loading_on_facebook.pdf
    • https://cdn.sqhk.co/jogowijalaro/Hidgigg/tetitevuza.pdf
    • https://cdn.sqhk.co/simikitivo/f9Jiax6/popeye_cartoon_song.pdf
    • https://cdn.sqhk.co/vibisimak/qjijjhc/88344077916.pdf
    • https://cdn.sqhk.co/womafafowix/I6giggT/7_continents_of_the_world_map.pdf
    • https://jojapewabivato.weebly.com/uploads/1/3/1/3/131379205/sikonabane_tisisek.pdf
    • https://cdn.sqhk.co/tabuguran/bhejfbk/11715790122.pdf
    • https://lezevonunibo.weebly.com/uploads/1/3/4/5/134577944/zuxizojewe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bc260b4e-efc2-469d-9102-9c7234992d76.filesusr.com/ugd/b1b3ad_f073aca6cc3642f8b5b1960b21ab0234.pdf?index=true
    • https://s3.amazonaws.com/budovewesekaz/basic_step_down_transformer_diagram.pdf
    • https://s3.amazonaws.com/mogedozara/zezuzipexugajalotamidi.pdf
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_52ad7b84fa234fefabf84a24d8222f24.pdf?index=true
    • https://s3.amazonaws.com/zufaxepixiguxax/sunikolasenevagobiz.pdf
    • https://da9d63b4-fbfd-4f6f-88e7-06ac0d76355b.filesusr.com/ugd/ca300b_17d162bef2d5469ab1b108369821c9e1.pdf?index=true
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_10bfaa06f5f1422e8e06f1a0667a2ffc.pdf?index=true
    • https://aa700e4b-9450-4a85-8b7e-8c92ffe47626.filesusr.com/ugd/de972d_33230473791c4691ac54f22053251f86.pdf?index=true
    • https://s3.amazonaws.com/werowibovezoje/answering_your_vexing_culinary_questions.pdf
    • https://s3.amazonaws.com/lanorolowu/globo_reporter_portugal_completo.pdf
    • https://s3.amazonaws.com/jubiferekaka/audio_technica_at-lp60bt_belt_drive_bluetooth_turntable_-_white.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e308.bin
09c4d92d4fd5b96b8b1e655e4d6bb03bc81c699d59b0c2716069519f7ea9d19d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE308 5528 bytes
font_01_sfnt_off0000f5d4.bin
7187d98d55a8560b89710ed273ab6b81379dda175ccfd711f413354b84c660a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D4 5760 bytes
font_02_sfnt_off00010590.bin
a628a20aa659a94c19b66b9d6d3c45aeddfe4ea6f0cf6465ae08dbc5f28d3700		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10590 10972 bytes

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