Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c3cdf77d26c4c8…

MALICIOUS

PDF

80.2 KB Created: 2021-02-03 08:01:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 690bd529257e9a68c9f66e4e91193c03 SHA-1: c8091070638d63cc677622c3be96b250174eb207 SHA-256: b4c3cdf77d26c4c89206fb6f31e65ea1624509b55f7903dbae0927fdfc1943cc
156 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 external links, many pointing to Weebly-hosted PDFs with numeric slugs, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are common in phishing and SEO spam campaigns.

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=functions+in+sql+server+examples PDF link annotation
    • https://titumakusijuvap.weebly.com/uploads/1/3/4/3/134353199/1674887.pdfIn PDF document text
    • https://vixixufabajuwe.weebly.com/uploads/1/3/1/1/131163632/winavizekijo.pdfIn PDF document text
    • https://maviwodoke.weebly.com/uploads/1/3/1/6/131606431/7795904.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366339/normal_5fe0dde3afa18.pdfIn PDF document text
    • https://tadizusojad.weebly.com/uploads/1/3/2/7/132712436/d0fd611f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486745/normal_5fcb69c05865a.pdfIn PDF document text
    • https://vubeluzuge.weebly.com/uploads/1/3/4/3/134357782/zenebomew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402000/normal_5fcdc4b55770c.pdfIn PDF document text
    • https://gawakugoful.weebly.com/uploads/1/3/4/7/134757428/9223206.pdfIn PDF document text
    • https://wokonupojelofa.weebly.com/uploads/1/3/5/3/135351156/6699780.pdfIn PDF document text
    • https://nupepapuk.weebly.com/uploads/1/3/1/4/131484133/kabipuw-wefojupibi.pdfIn PDF document text
    • https://viradigoposexa.weebly.com/uploads/1/3/4/3/134383508/ruwevararode.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424009/normal_600403b174740.pdfIn PDF document text
    • https://lesamasipedu.weebly.com/uploads/1/3/0/7/130739144/f43bb294a6a5b3.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/dumupa/bahubali_2_songs_naa_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/nutanigonu/pewefedagojovapugufog.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/manual_de_taller_kia_cerato_2012.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/93915498621.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_off0000fb42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB42 5288 bytes
SHA-256: f22bf2b0028e367619d6af3bfdfc52695dc8e0b09c8e593cdbb3f3d67564874a
font_01_sfnt_off00010d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3D 11412 bytes
SHA-256: 35c6e64c1059928f9032066776ed7c468151a617800b12ae9b91a561920679ab

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