Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae1fb75ef12d98f…

MALICIOUS

PDF

73.2 KB Created: 2021-02-19 20:26:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 16e980aca5ab0d71c6e0b9f4e54eba9c SHA-1: 546c557cef9abbf48838f5a51a76131b7b50e193 SHA-256: 8ae1fb75ef12d98f82970a66fd8c511aac6d902849f030972529f7fc5a9fe50a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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. 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
  • 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.
  • 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://crophysi.ru/123?utm_term=manual+de+funciones+de+la+dian+en+colombia PDF link annotation
    • https://xizuxikeg.weebly.com/uploads/1/3/0/7/130740292/vimixowesudafo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454281/normal_5ff6245321948.pdfIn PDF document text
    • https://cdn.sqhk.co/sururezog/VhgDjd1/pegopuzalaniwejamikal.pdfIn PDF document text
    • https://zuriloteva.weebly.com/uploads/1/3/4/6/134623588/2603734.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/fo2jbha/tik_kik_app_not_working.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405662/normal_5ffbca737c62d.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/zikeko/6878958343.pdfIn PDF document text
    • https://s3.amazonaws.com/wowonesoribu/17961083664.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/printable_weekly_planner_template_word.pdfIn PDF document text
    • http://webukoxaxox.rf.gd/55600564973.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/kedudukan_akuntansi_manajemen_sebagai_sistem_informasi.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/liver_biochemistry.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/nigovaxigukisonutitikede.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/ninetimupibifolitovu.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/eur_1_certificate_template.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_off0000ddfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFA 5216 bytes
SHA-256: 2cc88e721bde6d74d9701026b03ec98b92823086cdb83d23ffecc249982d9b66
font_01_sfnt_off0000efb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB8 11920 bytes
SHA-256: cb8620ce47e19ce77a1129b4fd8604159ef2b6f94c35656379d08b2e4f2659ef

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