Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aec4df9de12b7fe…

MALICIOUS

PDF

78.2 KB Created: 2021-05-31 23:39:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f9796ad65510eb821653cd576f4eecc9 SHA-1: b0c5d931e802a91daad9a9520dbb080e68fdde8a SHA-256: 5aec4df9de12b7fe6c0fcf112ad35c11895ab1a47dd1bd7b26e6ff2cc5e48eb2
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by both ClamAV and an ML classifier. It contains a large number of external links, many of which are on disposable hosting and utilize UTM parameters, indicating a link farm or phishing attempt. The document body is heavily obfuscated and unreadable, but the presence of numerous external links suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • 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://chcial.ru/pbw?utm_term=does+bryant+evolution+thermostat+have+a+battery PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392457/normal_606a55349a6fb.pdfIn PDF document text
    • https://sisuwupuwadigif.weebly.com/uploads/1/3/1/4/131437471/8d3de0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486359/normal_5fd95cba991ab.pdfIn PDF document text
    • https://nabapobu.weebly.com/uploads/1/3/7/5/137501246/bixomi-pigizagex-bosiripupag-pukiwomogu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448556/normal_6003382a30560.pdfIn PDF document text
    • https://lixabepona.weebly.com/uploads/1/3/4/5/134530066/bezije_jowobukutulut_wiwigekuje_sudufemid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367279/normal_5ffcb06d01ee4.pdfIn PDF document text
    • https://jedirixaz.weebly.com/uploads/1/3/4/8/134875163/5013448.pdfIn PDF document text
    • https://wededizopi.weebly.com/uploads/1/3/3/9/133986349/darexupo_razamezer_kivom.pdfIn PDF document text
    • https://jatufabafalili.weebly.com/uploads/1/3/1/6/131637938/dorituduba.pdfIn PDF document text
    • https://tilipigenetuwa.weebly.com/uploads/1/3/4/7/134770736/bbb5773.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb21dbdf-608e-4f25-8689-815c4f160b99/2004_ford_focus_battery_voltage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5c812fe-5117-47e7-b2c5-05a4df742207/44171850109.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/756a2649-98d8-486c-95d4-8f9a077de937/pictures_of_john_denver_and_his_wife_annie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03f5f401-912e-4ea0-b165-51c94446ebad/libro_mi_album_preescolar_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e21f468-3aa9-4067-81d6-b74a0d8b559f/apa_itu_sepsis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/043ac724-51b9-475b-99b0-a86d885ae783/3_main_ideas_of_natural_selection.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f72cc5ad-9767-4442-96bf-f51e1f64610a/how_to_create_fillable_form_word_2016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b3e4a26-c37b-48f6-a77d-b719bb5c12a6/what_does_chrysanthemum_seedlings_look_like.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cd20ce4-f3e5-473d-aac4-c1a3d914fb85/photo_editing_png_background_hd_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88869640-db8d-480f-a45b-d8d5d6001640/43230305497.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4512fadf-6891-4395-b0e5-8e60fea88725/63026857698.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eed015b0-897c-4f4f-aad9-de8c1c312f55/dovatagoraduxozik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e98de2b9-0968-4e26-85fd-81f36e49f893/go_for_no_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ded3c24-ce75-4793-b7a1-f6f097e6de5d/fit_for_life.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22A 5224 bytes
SHA-256: dd49a14333f1d6425de795cd9405793d98cd59308bd00b072ce7d84f37665e8b
font_01_sfnt_off000103d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D5 10944 bytes
SHA-256: cb6d71cb18311b447702cd6a03eead42e1520dd8b6c37bb53e5feb9a400b55f9