Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae6a849d37d950a7…

MALICIOUS

PDF

77.0 KB Created: 2021-03-24 13:02:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27ff7c85848be7ca1b546539cc97b546 SHA-1: 4436a1115af16d1fe54a09ba6fabdd4c9fa8968f SHA-256: ae6a849d37d950a7498fd09cbe1d0d9b35e11aac6bc6c600151c2bb23a9523d2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, with one pointing to a suspicious URL that appears to be part of a phishing or malware distribution scheme. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the document is designed to redirect users to potentially harmful websites.

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://jacksth.ru/strik?utm_term=now+accepting+boyfriend+applications+quotes
    • https://cdn.sqhk.co/xopuxuvop/hbhdgeU/19833829282.pdf
    • http://nexofozupugasi.mywebcommunity.org/why_does_dyson_vacuum_lost_suction.pdf
    • http://suvuxivenorum.mypressonline.com/roraxivepudanopizuk.pdf
    • https://cdn.sqhk.co/bedipidis/BYrjbid/color_picker_in_excel_2010.pdf
    • http://jurojegame.getenjoyment.net/lorivezixolipazenuwizun.pdf
    • http://tibudirowe.mygamesonline.org/11691256446.pdf
    • https://cdn.sqhk.co/zovaratigu/Fgj1icL/rezotojagevuvawobomo.pdf
    • http://kexolifowuj.medianewsonline.com/green_smoothie_lifestyle.pdf
    • http://sekelenogake.getenjoyment.net/introductory_stories_for_reproduction_2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://70848fb0-0fd0-490a-9360-2ffa38fc212c.filesusr.com/ugd/08e331_32e1b0a54d6144438c2725c6e23eb2b6.pdf?index=true
    • https://s3.amazonaws.com/tozaduliwubega/98755136345.pdf
    • https://f621ecf8-e26c-4db3-9bdf-176eeceb312d.filesusr.com/ugd/b3755e_faac03a8e9e74fde9ba5d9836e7aff35.pdf?index=true
    • https://17c3d818-7f64-4152-976a-2fa997d7a7be.filesusr.com/ugd/e2c250_c8fca65a36c5400481f6d420e28dd465.pdf?index=true
    • https://af1bea64-f5cd-41c2-a7c1-97f21c1aa057.filesusr.com/ugd/592671_e9903cff9e854fc087f9d4f7d34caff6.pdf?index=true
    • https://ffcd7f67-9b43-45c2-8e44-b15cca9583b8.filesusr.com/ugd/48bf55_8b4e0f31faf24742b54a398d0a0c4152.pdf?index=true
    • https://s3.amazonaws.com/jemisajoda/tupac_changes_audiomack.pdf
    • https://65d0a56f-4074-4e8f-9acc-29e6f8e8f663.filesusr.com/ugd/37655d_3cb5d3a1203c47bf80c89883355c02ea.pdf?index=true
    • https://s3.amazonaws.com/fuvidokibet/39142901105.pdf
    • https://aa5f33e9-793b-4807-a257-9eac84d314d0.filesusr.com/ugd/aa57b2_742bb4c5fbd94c93913bd2534c6c6d17.pdf?index=true
    • https://s3.amazonaws.com/pezofut/nigaxozit.pdf
    • https://dca540c6-954d-4243-9f09-0921753db957.filesusr.com/ugd/974a4e_0ff9ac8e510541fcbf4dcde69e760aa7.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_off0000edcb.bin
3a20df5666f206baac6bb458acfa8b5c36c7ea350ace1b52565c9b9499baa430		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCB 5752 bytes
font_01_sfnt_off00010185.bin
36626888b7270fd3735abbc470983c247aada3bea91723e7d52bf70885d2034d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10185 10900 bytes

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