Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5dbbdedb67c93de…

MALICIOUS

PDF

84.6 KB Created: 2021-03-30 13:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3ba322097ddc5aa033b1c8bcd44dae0e SHA-1: 9e3696b01c61174d77806592fe6bd4d52eec939a SHA-256: a5dbbdedb67c93de76b221f28f3ba1d9868bbdf1ad0dd72aabe0ec5789d53340
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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=2005+honda+odyssey+fault+code+p2646 In PDF document text
    • https://cdn.sqhk.co/winelolibug/jifNkRZ/telosukuje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375886/normal_5fe7d9d0262fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425726/normal_5fcc9a569b9ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475727/normal_600897afe9696.pdfIn PDF document text
    • http://soxawebemewusa.iblogger.org/7768875087.pdfIn PDF document text
    • http://alesyasemiletova.com/254000439264rg19.pdfIn PDF document text
    • https://cdn.sqhk.co/salulilo/6hcnjiZ/saxiditudojizage.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388839/normal_5fc5cd66a1317.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380692/normal_601d2ae9ae598.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384142/normal_5fcef4433666a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471230/normal_606279bb06f88.pdfIn PDF document text
    • http://eagleaff.com/45668551199ut1rw.pdfIn PDF document text
    • http://icub.tech/inception_time_piano_sheet_musicuz7sr.pdfIn PDF document text
    • http://nekalakizifefe.22web.org/sirejajijuxuvuvedubuwew.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://s3.amazonaws.com/jitimesolagun/notice_of_executive_committee_meeting_template.pdfIn PDF document text
    • http://kevulapoxokimif.rf.gd/79189181861.pdfIn PDF document text
    • http://legukekujuso.rf.gd/26155952129.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/ics_214_form_word.pdfIn PDF document text
    • http://fofeparulofiz.rf.gd/bouwbesluit_2020.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_off0000fd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD55 5628 bytes
SHA-256: dbf03f0972c34f95cff9d01c543f8a2be867dad253797489f5a37689926b4317
font_01_sfnt_off00011077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11077 11212 bytes
SHA-256: 9f6c6aea5e8f9b4c86987484b3a1de475cafe256ba44d9807d4768fcd609863a
font_02_sfnt_off00013701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13701 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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