Malicious PDF — malware analysis report

Static analysis result for SHA-256 55567c32d9a2921c…

MALICIOUS

PDF

65.3 KB Created: 2020-11-19 03:47:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 46d2e7ecce2b6d340afcb02dd831b100 SHA-1: 2e818dc784bc6f3a8514a0ae35c3728709d8337d SHA-256: 55567c32d9a2921c6ffcfd027f8bccf26b26a4c264849c1ac1e3b01968444d4e
184 Risk Score

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 0.9997

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://traffmen.ru/strik?utm_term=internet-Technologie+und+web-design In PDF document text
    • https://topemarepebide.weebly.com/uploads/1/3/4/3/134316461/79691493e5c5.pdfIn PDF document text
    • https://lifesodoxeduze.weebly.com/uploads/1/3/4/3/134372712/kifabuk-mofaxozazuze-lidet.pdfIn PDF document text
    • https://fitakizegeva.weebly.com/uploads/1/3/3/9/133999514/dudapomedeb.pdfIn PDF document text
    • https://texolobalow.weebly.com/uploads/1/3/4/5/134597330/3826179.pdfIn PDF document text
    • https://digafixi.weebly.com/uploads/1/3/0/7/130776371/7433097.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/3794757.pdfIn PDF document text
    • https://vepaxanejabag.weebly.com/uploads/1/3/4/3/134317352/ecc5af6ddf.pdfIn PDF document text
    • https://luvumape.weebly.com/uploads/1/3/4/4/134438520/6b25b14493920.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/toguvaju/retinol_vitamin_enriched_anti_aging_sheet_mask.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/umass_dartmouth_2019_2020_calendar.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/meaning_of_direct_address_in_film.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/jidajidetewojetufevobun.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/71736438641.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_off0000b572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB572 5120 bytes
SHA-256: 990f8e274c32230eeb12bfe274f42075c2e6c2acee324adfdc1d1a1650930663
font_01_sfnt_off0000c6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DE 10612 bytes
SHA-256: e8d6906cf6906a64d82fa73a6e388e0d827261c132746a2cf1734b15d029a157
font_02_sfnt_off0000ea25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA25 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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