Malicious PDF — malware analysis report

Static analysis result for SHA-256 72d88f3f85a974bb…

MALICIOUS

PDF

70.8 KB Created: 2021-02-14 22:09:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: dbf37f6e8046e25f6b99c815f3f935e6 SHA-1: 57e50acedb8bbfb6f89387b5dd05ffc3d5e4d574 SHA-256: 72d88f3f85a974bbf03b6afd4090e481e8ef087c5720040b1df80b6fb600bad7
166 Risk Score

Malware Insights

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

The PDF file is detected as malicious by ML classifiers and ClamAV, and it contains heuristics indicating it's a link farm designed to lure users. The 'SE_REMOTE_SUPPORT_LURE' heuristic specifically points to the document instructing users to install or connect with remote support tools, suggesting an attempt to gain unauthorized system access. The embedded URLs likely lead to further malicious content or tools.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://jottigo.ru/aws?utm_term=basic+concepts+of+democracy+section+3+worksheet PDF link annotation
    • http://20970907.net/87840941841grtmo.pdfIn PDF document text
    • http://leopolds.space/xuzinexubac9mn0.pdfIn PDF document text
    • http://hustlinmoney.com/laundry_shop_business_plan_philippinesfruki.pdfIn PDF document text
    • https://cdn.sqhk.co/fajoliteve/jghhZhf/teamviewer_quicksupport_mac_old_version.pdfIn PDF document text
    • http://xitnet.fun/kumofureluwogapoxuduxigo0nv1.pdfIn PDF document text
    • http://comp-arenda.site/rokaxitixibudolabaj4.pdfIn PDF document text
    • http://sebaxupakokak.22web.org/chuyn_t_file_nh_sang.pdfIn PDF document text
    • http://penerete.66ghz.com/straight_bill_of_lading_short_form_example.pdfIn PDF document text
    • http://idealica-official-it.website/great_farmers_in_the_world3k5ca.pdfIn PDF document text
    • http://torchqbfl.fun/baidu_browser_apk_latest_version73jny.pdfIn PDF document text
    • http://techanomic.com/38166323175m1ydi.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
    • http://xebowuruno.epizy.com/28482469914.pdfIn PDF document text
    • http://modunatotuw.epizy.com/best_android_browser_that_can_videos.pdfIn PDF document text
    • http://zagizub.rf.gd/making_my_own_lasagna_sheets.pdfIn PDF document text
    • http://tawexega.epizy.com/44785797383.pdfIn PDF document text
    • http://jafojib.rf.gd/1805170191.pdfIn PDF document text
    • http://fifusudevop.rf.gd/adidas_performance_pureboost_go_ltd.pdfIn PDF document text
    • http://wanedinak.epizy.com/carbene_formation_reaction.pdfIn PDF document text
    • http://tewaremiluzavag.rf.gd/zoo_animals_colouring.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD7 5620 bytes
SHA-256: b8a943a6c33b224c288a56a573e5cccb5ded8c108d25e3559587a492d2eab94f
font_01_sfnt_off0000ddd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD1 10164 bytes
SHA-256: d32b4e8b64091686a1c8b931ae5c444682018515dff4cf1c4a84346f78187cd7
font_02_sfnt_off0000ffe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE3 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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