Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac268a976ffb9c0d…

MALICIOUS

PDF

182.4 KB Created: 2021-04-19 06:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4513d3806681a56151fa48a5ae0d5ef SHA-1: 21bee089cce0518fbb7ff91bf8cd2189ab65641f SHA-256: ac268a976ffb9c0d0280319a03816652a8daf23239bf6a25fa21747f030dc71c
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It contains a high number of embedded URLs pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior, and the presence of `utm_term` parameters in some URLs indicates a potential phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://kuzutuzo.ru/strik?utm_term=cambridge+preparation+for+the+toefl+test+%2528book+%2526+cd-rom%2529+4th+edition+pdf
    • http://beliyden.xyz/208286193459tg7y.pdf
    • http://medicalpracticementor.com/cuantos_gramos_tiene_una_cuchara_de_levaduramvwli.pdf
    • http://dapujabowigu.sportsontheweb.net/59224225900.pdf
    • http://kataeta.club/manualidades_con_reciclado_de_botellastdcbp.pdf
    • https://pizazolumugi.weebly.com/uploads/1/3/4/0/134016987/punubilipesumupefu.pdf
    • http://testersairf.xyz/85207878140oit8l.pdf
    • http://tehnotop.site/blender_addons_free55xk3.pdf
    • http://xufuxenu.mypressonline.com/adda_247_data_interpretation_book_download.pdf
    • http://salebox.shop/53180767618d6ctm.pdf
    • http://tokio-2020.fun/wosomop93f81.pdf
    • http://tevutubiwij.getenjoyment.net/cards_against_humanity_cards.pdf
    • http://businessoutsourcing.info/colorectal_cancer_screening_canada_guidelinesu46sp.pdf
    • https://cdn-cms.f-static.net/uploads/4457320/normal_6054499c99529.pdf
    • http://befotuke.mywebcommunity.org/nowadizifafiritife.pdf
    • https://kosofisipituje.weebly.com/uploads/1/3/5/3/135329454/f8ada712.pdf
    • http://vizionsmc.net/29007471720lgbci.pdf
    • https://wumupokurura.weebly.com/uploads/1/3/0/7/130776197/magebifigikujilurisu.pdf
    • http://pixell.store/what_major_events_happened_in_the_1900sllqj0.pdf
    • https://xizirujikalowev.weebly.com/uploads/1/3/1/4/131454807/df6ebeea1.pdf
    • https://static.s123-cdn-static.com/uploads/4378831/normal_5ff45aadb9b50.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.orgThis
    • http://www.daltonmaag.com/
    • http://www.fontrix.comhttp://www.nhncorp.com
    • 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
    • http://scripts.sil.org/
    • http://scripts.sil.org/OFLAbyssinica
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001fb8b.bin
0a27c7c9e289ed25a1556ba2de17a14594871cfa9941569b91eaaf866b7bb6c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1FB8B 5644 bytes
font_01_sfnt_off00020e8b.bin
467c54f87792cd57074dee0d62becd2a67bc754ef7045aaf30c1829f6656ef01
pdf-font-stream PDF embedded font (sfnt) at offset 0x20E8B 26064 bytes
font_02_sfnt_off00023aca.bin
a4003613c19ae993fb34df247cc4f06f372625b72dd47625ca2d5116ec2bd5ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x23ACA 15892 bytes
font_03_sfnt_off000272d8.bin
4a4d69f2fa381023dd2699efc89d7443c9fd1222dd017bfd39e03ae16dbd26dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x272D8 4084 bytes
font_04_sfnt_off00027fa3.bin
9a4398ed3a9e8864d5118bb9e84cb0651eaf8d2564846be8a82060f7f9686674
pdf-font-stream PDF embedded font (sfnt) at offset 0x27FA3 11288 bytes
font_05_sfnt_off0002a563.bin
2122237371394a14ad679a47d93e06ddcf02d14fe38ef06df83cf228124ecb5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x2A563 4152 bytes
font_06_sfnt_off0002b471.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd
pdf-font-stream PDF embedded font (sfnt) at offset 0x2B471 16204 bytes