Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffdb579482faf4f7…

MALICIOUS

PDF

64.7 KB Created: 2020-12-11 06:42:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4d0d5df2ec22e4d11704281208afbe7d SHA-1: ddacbefc7a7b0262039ea7ef46a5a3b6a1af4da4 SHA-256: ffdb579482faf4f79ccede6c4660bdec20bafc3250aafabb38098eaf76469ba3
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 0.9996

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://traffset.ru/strik?utm_term=complex+wh+questions+for+adults PDF link annotation
    • https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/1311743.pdfIn PDF document text
    • https://fepaxumezo.weebly.com/uploads/1/3/4/3/134320712/4796818f5.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/rorives/71108751092.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc32ae812facd59cebbb095/t/5fc3d2d32dd96f5918631909/1606669013123/bdo_mystic_guide_discord.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/biodegradable_plastic_from_cassava_starch.pdfIn PDF document text
    • https://s3.amazonaws.com/kavugusepe/quality_control_and_reliability_engineering_book.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/94306033850.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1133de2-85ea-49ea-83f3-77aaf38adc09/volozefojubonufajolonadip.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/nuzejofedirareruxugopixa.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/webinemopogeximugovegow.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_off0000c1cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1CB 5472 bytes
SHA-256: 51a171e8adc49df26da18cc1eb986d886e70b94ebf5306c219d0418762dfdb54
font_01_sfnt_off0000d44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44A 10096 bytes
SHA-256: 1f827c52e029b7466a15ff574d3afcd27e497eda34b0eff19096554ae2189e0c

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