Malicious PDF — malware analysis report

Static analysis result for SHA-256 123a8ba2e11c94ac…

MALICIOUS

PDF

156.1 KB Created: 2021-03-07 08:36:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 035c7ea477b7a917df3367747026c55d SHA-1: 8c0087e18926911e1aef50d459a781e6582ae71d SHA-256: 123a8ba2e11c94ac87cd0eed965139f378a2a99e62b376559e3110a215751884
166 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to distribute malware or facilitate phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users to malicious sites. The presence of 'curl_comb_thru_texturizer_reviews.pdf' in the document text hints at a potential command execution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://golowaki.ru/123?utm_term=ancient+greek+and+roman+art+time+period PDF link annotation
    • http://universityru.fun/bluetooth_keyboard_android_logitechqxui2.pdfIn PDF document text
    • http://rankingcoach-apps.com/danupipizemc1nc.pdfIn PDF document text
    • http://contact-git.top/endocrine_society_of_sri_lanka_guidelinese3rly.pdfIn PDF document text
    • http://blacktea.space/minuvirafumuz3kzzk.pdfIn PDF document text
    • http://hugertely.xyz/vatexuvaludenyj8wh.pdfIn PDF document text
    • http://figimumagoko.mygamesonline.org/fiduvuruwi.pdfIn PDF document text
    • http://parrrtner.xyz/what_is_the_meaning_of_howlwbc0b.pdfIn PDF document text
    • http://nefritthebestthing.site/43482411893mbk1z.pdfIn PDF document text
    • http://vk-settings-change.online/86881289849ba170.pdfIn PDF document text
    • http://romeita.space/gaxedi7p5wq.pdfIn PDF document text
    • http://sungo1.space/83146530172isv5s.pdfIn PDF document text
    • http://werojati.getenjoyment.net/betavamor.pdfIn PDF document text
    • http://vubitim.sportsontheweb.net/bikiz.pdfIn PDF document text
    • http://rawoxaxevog.mygamesonline.org/95079251415.pdfIn PDF document text
    • http://proita.space/what_is_an_a_level_equivalent158ua.pdfIn PDF document text
    • http://vannabanyavsedela.xyz/1979423972769zdx.pdfIn PDF document text
    • http://xedeporib.medianewsonline.com/1970_ford_mustang_mach_1_428_cobra_jet_value.pdfIn PDF document text
    • http://kapusta.pro/papafobagotojahc5t5.pdfIn PDF document text
    • http://allostar.buzz/how_to_see_your_business_credit_scoreiymym.pdfIn PDF document text
    • http://vomimaforotagi.mywebcommunity.org/s_curl_comb_thru_texturizer_reviews.pdfIn PDF document text
    • http://wellwork.site/77466114189ctjcd.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://13fad4bf-7224-44b3-802b-16842e97d241.filesusr.com/ugd/b14664_954b39cb0f9b4714a429602bb6ae0bf8.pdf?index=trueIn PDF document text
    • http://sajulugebimisu.myartsonline.com/different_curriculum_model.pdfIn PDF document text
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_04cb292c5aea4a34ac5dfea39d32aa20.pdf?index=trueIn PDF document text
    • https://1c54689f-8f60-44d8-8d81-b144d6ea8ada.filesusr.com/ugd/787b0a_57c9347e114c44589609992f18a51a00.pdf?index=trueIn 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_off00021a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21A57 5024 bytes
SHA-256: aa1116c66dc2ff50fdcf6a051d8d557b34befcfdf0c1b049bfe35c8d42e3fe23
font_01_sfnt_off00022b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22B4A 12040 bytes
SHA-256: a96adaddb0e88c0183537b0a012e3c7788f7b13e5ac8e65f87e1f7ad3d611d89
font_02_sfnt_off00025351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25351 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c