Malicious PDF — malware analysis report

Static analysis result for SHA-256 df48f7aa5a7e5e6e…

MALICIOUS

PDF

97.8 KB Created: 2020-12-26 13:34:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 4bc4127a41aa533b27b02511d8ebd3d2 SHA-1: 9cdb073ca834080e7230959499e0e47af8e4d7be SHA-256: df48f7aa5a7e5e6e0aa76f364b977f103c50c0aa87103d9feb378d6d8856cabc
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, with several pointing to known malicious redirectors and link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the primary attack vector appears to be the extensive use of malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://cctraff.ru/aws?utm_term=skewness+coefficient+pdf In PDF document text
    • https://zevamomarage.weebly.com/uploads/1/3/4/6/134611313/4689951.pdfIn PDF document text
    • https://gabejopow.weebly.com/uploads/1/3/4/5/134597712/muroro.pdfIn PDF document text
    • https://lipowuripipu.weebly.com/uploads/1/3/1/3/131378852/2491965.pdfIn PDF document text
    • https://kojaresojew.weebly.com/uploads/1/3/4/3/134312518/takul_wofuwakamigo_wipejijik_gimumafax.pdfIn PDF document text
    • https://dakufosaxem.weebly.com/uploads/1/3/4/7/134771611/zuterizokomuzej-labulelo-denunowuve.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/tesapibebujep/browser_for_pc_free_latest_version.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/xipixorejosoxujilaxaw.pdfIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/whole_house_humidifier_reviews_consumer_reports.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ebd2802-b494-48ea-bed4-2e3cef9903ac/89925114138.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/yuki_sohma_birthday.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/precipitation_and_agglutination.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEA 4856 bytes
SHA-256: b3b61f20af6c72e13815df322808263d8f0290334dbca02706c79694fac23270
font_01_sfnt_off00011c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C96 12736 bytes
SHA-256: dfa3eb829e3debb641f3170deb74ef208b057c8c7c9f19440f65af1fef2b56ea
font_02_sfnt_off0001485b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1485B 16064 bytes
SHA-256: 28c03bcf599e3456f71dbda7a9940e8017c4b7a6e15fdbd9d4eba8bfcd1a11e4
font_03_sfnt_off00015cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CFD 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
font_04_sfnt_off00016ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AC0 6084 bytes
SHA-256: 0bbd385887db5074fbd87256d70f98a882c9353f1362fd6c1377f0ce146e0394

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