Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e06f1d0d6e470a7…

MALICIOUS

PDF

87.9 KB Created: 2021-03-14 11:39:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 939846977b041c38b775c6870354e9e9 SHA-1: 45298159b78715a0958454438d3fc011384f8f35 SHA-256: 4e06f1d0d6e470a7ff9872a41cfc409ebdc5d3612ca5a2cc520194d0b88712d3
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, with the heuristic 'PDF_SEO_LINK_FARM' indicating a mass of external PDF links. The document body, though heavily obfuscated, contains text related to a "Bloomington il comcast channel guide" and the authoring application "wkhtmltopdf", suggesting a lure document. No scripts were extracted, but the presence of numerous external links points towards a phishing or SEO-based malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://kuzutuzo.ru/wix?keyword=bloomington+il+comcast+channel+guide
    • https://givurili.weebly.com/uploads/1/3/4/6/134605008/vidozo.pdf
    • http://busibear.com/ludamegisob8ms4i.pdf
    • https://zuxadozi.weebly.com/uploads/1/3/4/6/134662888/5481254.pdf
    • http://minuette.me/getting_started_with_spring_framework_j_sharma_download53xe2.pdf
    • http://fatimuze.22web.org/levuvolowokexodilagikel.pdf
    • http://parhelifrl.space/how_to_use_student_assessment_data_to_improve_instructionm997s.pdf
    • http://callipakk2.site/353608615576asl7.pdf
    • http://jotositafi.22web.org/where_can_i_exchange_soda_stream_cylinder.pdf
    • http://ehaberdevlet.com/36001811419eyced.pdf
    • http://winfreeiphone.xyz/forizururovosibalasop1543.pdf
    • http://masalev.ru/cvs_flu_shot_consent_form_20191qbz2.pdf
    • https://nebunabimumebu.weebly.com/uploads/1/3/4/4/134480995/5978049.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lidufaz.epizy.com/77619682864.pdf
    • http://jurigixa.rf.gd/76651670088.pdf
    • https://uploads.strikinglycdn.com/files/c56fa587-ff61-4946-8a6f-2b6741dba9d3/how_to_prepare_for_an_executive_administrative_assistant_interview.pdf
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_56b57583438b436fba1a68c1a3d6d533.pdf?index=true
    • https://uploads.strikinglycdn.com/files/dab3cfa2-1290-4d90-8733-a2bd479b4166/safe_haven_cast_interview.pdf
    • https://uploads.strikinglycdn.com/files/194f0a89-1bcc-4273-9495-db3509de46f1/45062933994.pdf
    • https://72dfff08-f6cb-4f5d-aaac-ebe71175d6a6.filesusr.com/ugd/c268f7_104a250fbe8b4f08a4eee0a030b1a12b.pdf?index=true
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_4610d954d493495ead1f87bb954f9607.pdf?index=true
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_031b1702ed2e4f6ebc4623f3dbc8bcf4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/484e29dc-d483-4d3a-b28c-f5acef3db203/what_is_the_meaning_of_phrase_burn_the_midnight_oil.pdf
    • https://899154e9-876a-4ab4-94d5-c8ef2aed10f2.filesusr.com/ugd/dcf9ad_fc8cc667b1174c2993602819b90d42bd.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ff1.bin
4fb05dd87cc26ce482c7535bef9e079aa1eced492f91c86288e16d31eb78ce22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF1 5308 bytes
font_01_sfnt_off000121cf.bin
af411e4d7ffb4166296dc2cf4f636bef4573af66c71c6f779276487836f8c433		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121CF 1736 bytes
font_02_sfnt_off00012a53.bin
1c801f7480fd9fd15837ec96a56384ec0a1980bf35772b0cf00c09bb7b4299c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A53 11324 bytes

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