Malicious PDF — malware analysis report

Static analysis result for SHA-256 b28cd928573fd1b9…

MALICIOUS

PDF

89.1 KB Created: 2021-03-30 06:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41d90f1f2b7ae948c7a356c889d791a7 SHA-1: 8260fcd54acfcf9af0e176f2b604d75aa0413cf2 SHA-256: b28cd928573fd1b941fa357ebdb440a42edd360cc295dcca6aef097977512136
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a phishing or malicious content distribution attempt. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains a large number of external links, likely to manipulate search engine results or redirect users to malicious sites. While no scripts were extracted, the presence of numerous external URLs points towards an attempt to lead the user to potentially harmful content.

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-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://bologen.ru/wix?keyword=denon+avr+591
    • http://help-business-media.com/tukamiraxjt0ie.pdf
    • https://kuxobemif.weebly.com/uploads/1/3/1/3/131379353/batutin.pdf
    • https://banugaso.weebly.com/uploads/1/3/5/3/135326488/51e2d1c588.pdf
    • https://nunodovov.weebly.com/uploads/1/3/1/3/131380210/f51f1.pdf
    • http://prostotit.site/interior_design_web_templates_free_downloadqpscu.pdf
    • https://cdn.sqhk.co/noxomosanena/RihYAhk/24805665247.pdf
    • https://vazejaxos.weebly.com/uploads/1/3/1/3/131382607/7322006.pdf
    • https://kanemonel.weebly.com/uploads/1/3/5/3/135319287/0b6f498158104.pdf
    • https://cdn.sqhk.co/nuvaratuji/idjjmHp/cooking_joker_food_fever_restaurant_craze_kitchens.pdf
    • https://zowobisa.weebly.com/uploads/1/3/5/3/135313501/sofudinikurofavuj.pdf
    • https://simebusuf.weebly.com/uploads/1/3/1/4/131406507/gemisoxiserivos-visuzoruxizimup.pdf
    • http://whalesqpa.fun/zikodimugqpqkt.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/jidosatikim/24158895373.pdf
    • https://s3.amazonaws.com/tutapaxi/first_alert_smoke_detector_beeps_5_times.pdf
    • https://s3.amazonaws.com/novifamigot/35213880150.pdf
    • https://s3.amazonaws.com/xisefowu/kisijegolen.pdf
    • https://s3.amazonaws.com/rewepalazamiso/xokinevopibino.pdf
    • https://s3.amazonaws.com/defujo/vodumisuwakaka.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_off00011113.bin
1c604f285e9e7b435ff2f9e5448e63079d6dc636dcc305830ce89721fee08fd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11113 4520 bytes
font_01_sfnt_off0001207c.bin
b602d31dfaae5696e85cd9b63785e931641e6cbf850d5c8d9d68a99c84f271f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1207C 11612 bytes
font_02_sfnt_off000147da.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x147DA 4324 bytes

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