Malicious PDF — malware analysis report

Static analysis result for SHA-256 26c81705b97383f3…

MALICIOUS

PDF

80.0 KB Created: 2020-12-31 15:01:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 5f6da1599a985ab0114a5137adb907f8 SHA-1: c1e6dbdc2c06dce91a519c1d668df0583701e493 SHA-256: 26c81705b97383f34a29f0e832a803469a984f0dfbd0fb2dc380f1c0e323671d
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDFs, a technique often used for SEO manipulation or to distribute further malicious content. One of the embedded URLs, 'https://gettraff.ru/123?utm_term=15+electrical+circuits+worksheet+c+answers', is flagged as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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 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.
  • 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://gettraff.ru/123?utm_term=15+electrical+circuits+worksheet+c+answers In PDF document text
    • https://vulotimemoje.weebly.com/uploads/1/3/4/8/134846769/1f8d3817139.pdfIn PDF document text
    • https://cdn.sqhk.co/pibegufuxova/ehihhhg/piano_rock_band_4.pdfIn PDF document text
    • https://cdn.sqhk.co/pevelefotuve/A6jJhhr/invasion_modern_empire_cheats.pdfIn PDF document text
    • https://jurizimobijagi.weebly.com/uploads/1/3/0/8/130874317/c47cd247.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496148/normal_5fc09412d6c1b.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/sitozi/tournament_bracket_builder_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/57765828258.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/chrome_full_setup_offline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffa6d450-105f-4374-aa33-f3bcd778d16a/despedida_en_ingles_correo_formal.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/brene_brown_shame_worksheet_1.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/auditora_de_sistemas.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_off0000fb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB62 5124 bytes
SHA-256: c000bac281d7d73ee8fd9133a85127f49244c78f85a9b0d8aca66de025ae9e35
font_01_sfnt_off00010ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE4 11248 bytes
SHA-256: 8b3e9267c1e14daea7e897a2b499ef1693feaeb330b48c2a7ae958c5722569d3

Open this report in the interactive analyzer, or submit your own file for analysis.