Malicious PDF — malware analysis report

Static analysis result for SHA-256 e68128a5abe4c2b7…

MALICIOUS

PDF

77.9 KB Created: 2021-02-23 22:49:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 939c3963ca7b752e8e958609417068d8 SHA-1: 7280bc229db5f3d73055daceb49d4845838c150b SHA-256: e68128a5abe4c2b7e47786075c9e95b7c479434bbbc136631935faf8505876d3
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting or redirectors, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body, though heavily obfuscated, contains text related to a Honda CRV manual, likely a lure to attract clicks to the malicious URLs.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=honda+crv+manual+gearbox+oil+change In PDF document text
    • https://cdn.sqhk.co/zojixemem/kvSjehj/mugaguwuv.pdfIn PDF document text
    • https://cdn.sqhk.co/virurewev/ahfbijZ/rexenejipenefosuxetufow.pdfIn PDF document text
    • http://wovewor.iblogger.org/22154324681.pdfIn PDF document text
    • https://vemosesagegedow.weebly.com/uploads/1/3/4/3/134312783/3108987.pdfIn PDF document text
    • https://cdn.sqhk.co/kinifukix/aPQiaP2/95968610386.pdfIn PDF document text
    • https://cdn.sqhk.co/jesovolavig/Mhf6hav/breakfast_cooking_mania.pdfIn PDF document text
    • https://dugumali.weebly.com/uploads/1/3/1/4/131437411/6828f7.pdfIn PDF document text
    • https://lomameleni.weebly.com/uploads/1/3/4/5/134597964/tigivan.pdfIn PDF document text
    • https://telozigigozato.weebly.com/uploads/1/3/4/3/134310186/1b02ad3f8.pdfIn PDF document text
    • http://vugijow.iblogger.org/call_of_duty_mobile_apk_data_latest.pdfIn PDF document text
    • https://cdn.sqhk.co/vinogusi/jgcTgjc/uc_browser_downloader_app_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/fovulifavu/iagdhjH/racing_moto_3d_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/kujovuboxuda.pdfIn PDF document text
    • http://nozefemalevarug.rf.gd/amu_bums_admission_form.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/excel_2010_open_sheets_in_separate_windows.pdfIn PDF document text
    • http://dugexirawotuv.rf.gd/22384009748.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_off0000f606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF606 5404 bytes
SHA-256: 6dea16e9d04a890bbbd28b76e267517b5d9b48a20a1844f74fc6a6b931ca40a4
font_01_sfnt_off00010841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10841 9996 bytes
SHA-256: f5e8bb2f89eb18d1641459d17c74d93a82da9c5f84c91866ca24c25898582f88

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