Malicious PDF — malware analysis report

Static analysis result for SHA-256 c86d75c4682156c5…

MALICIOUS

PDF

85.7 KB Created: 2021-04-03 22:42:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: dd8120011604e6c1c83344d164a6ba9e SHA-1: 212edc8ce1ba59631571a56ba1862cae6a0c90cf SHA-256: c86d75c4682156c551b72c1e4414ed206e0ac7f6c914563274eab0e6c7f39258
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting an attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate effort to create a large number of links on potentially untrustworthy hosting, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://mezovuduw.ru/wix?keyword=elimination+with+multiplication+worksheet+answers PDF link annotation
    • http://circulshtangcalip.website/50243595120004v8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370778/normal_605dcd4a92503.pdfIn PDF document text
    • https://sizugive.weebly.com/uploads/1/3/5/9/135993047/3563430.pdfIn PDF document text
    • https://fobepomakiroka.weebly.com/uploads/1/3/0/8/130874330/51c6e795660.pdfIn PDF document text
    • https://cdn.sqhk.co/ribafesupuro/7hgicha/10235876695.pdfIn PDF document text
    • https://cdn.sqhk.co/mekewufi/ihkighg/98294926454.pdfIn PDF document text
    • http://nanolenka.xyz/cavafy_ithacabbo96.pdfIn PDF document text
    • http://fuckfrsky.com/un_tranva_llamado_deseo_pelicula_completa_subtitulada_en_espaol8ubos.pdfIn PDF document text
    • http://kawlites.online/what_american_words_are_different_in_englandg8zk8.pdfIn PDF document text
    • https://toxofeleziwogiz.weebly.com/uploads/1/3/1/4/131406173/f07bbd0.pdfIn PDF document text
    • https://womominajarizu.weebly.com/uploads/1/3/5/3/135392323/vapomelubigejo.pdfIn PDF document text
    • https://juwibaviwexufeb.weebly.com/uploads/1/3/0/7/130739975/5795398d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464297/normal_605e01f15addd.pdfIn PDF document text
    • http://gogejevi.iblogger.org/gezojepuletirekexor.pdfIn PDF document text
    • http://sluzhba1.net/jelaskan_konsep_cash_flow_quadrant_dari_robert_t_kiyosakifj5pj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/sinadi/lasedavepixumuzupoje.pdfIn PDF document text
    • http://duwawadava.rf.gd/70277501179.pdfIn PDF document text
    • http://nobajasasoda.epizy.com/kasidanezujesurir.pdfIn PDF document text
    • http://wotituxisu.rf.gd/zugalipawexosisi.pdfIn PDF document text
    • http://razikonuwivomo.epizy.com/academically_adrift_review.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/read_the_bible_in_90_days_iphone_app.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/android_studio_change_app_theme_color.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE5 5168 bytes
SHA-256: 0d2ad4e0903a7eaccc83c136a79650e101c733f740779d146453d8e8c7a135aa
font_01_sfnt_off0000fd50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD50 11484 bytes
SHA-256: 89e9599bd16bde303afede464c283ea5b71d1c803be9c31f763ac5ef07723c8d
font_02_sfnt_off000123d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D3 16060 bytes
SHA-256: ae97ebdbf5cb6679ee3ae7f6f8963da9ec2437ada1f672a33085bc8cbe806833
font_03_sfnt_off00013867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13867 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176