Malicious PDF — malware analysis report

Static analysis result for SHA-256 2533f31afc42ff18…

MALICIOUS

PDF

79.2 KB Created: 2020-12-18 07:47:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8d6a1166b053a2191ea056a7684593ae SHA-1: 470aa5751d613df99cb1a49e82d9dc9366d54b70 SHA-256: 2533f31afc42ff1871080fac18443bf71ebd9f8d805de45da0397f14e9e524c9
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm designed to distribute malware or lead to phishing sites. The document body, though heavily obfuscated, appears to be a lure related to 'Teas v study manual pdf'. No scripts were extracted, but the PDF structure itself facilitates the distribution of malicious links.

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://trafficel.ru/strik?utm_term=teas+v+study+manual+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369797/normal_5f87dc20ea62d.pdfIn PDF document text
    • https://titumakusijuvap.weebly.com/uploads/1/3/4/3/134353199/778622.pdfIn PDF document text
    • https://bufemiwod.weebly.com/uploads/1/3/4/8/134846302/jagav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367912/normal_5f8f1793e7746.pdfIn PDF document text
    • https://mipirizu.weebly.com/uploads/1/3/2/6/132682564/pomilezizolibo_kitarusatibu_seren_loxufagezir.pdfIn PDF document text
    • https://wumunelopilum.weebly.com/uploads/1/3/4/3/134395902/9446493.pdfIn PDF document text
    • https://bulasenojagaroj.weebly.com/uploads/1/3/4/3/134357248/suzewukutitesuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413712/normal_5faf296116dc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449622/normal_5fb8ef6849cc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415304/normal_5fd85d2d042bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376875/normal_5fa372f4122d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413966/normal_5f9a3d723655e.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/kudowo/xibep.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/192.168._1.104_login_admin_netgear.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_off0000f860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF860 5200 bytes
SHA-256: 00e32965cb7678c0086c68de1d3ce7a53f40c9d7fa9a0a9f044dd8b61bba7460
font_01_sfnt_off00010a15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A15 11120 bytes
SHA-256: 5de5810fe8aa49948b91e2b47581e1db487dc785ebebc59833242d6e752ff5eb

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