Malicious PDF — malware analysis report

Static analysis result for SHA-256 badfb73d2556bf94…

MALICIOUS

PDF

84.2 KB Created: 2021-02-25 07:09:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: a095493df6002b1628cc4e41cb7c464f SHA-1: 753fa0af745976c935b9daf8b1078d189667523b SHA-256: badfb73d2556bf94616a1740cce965de362d094b2cd9531449e2d6c450172fbd
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains numerous embedded links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' suggesting a large number of outbound links. The document body, though heavily obfuscated, contains text related to 'cooking merit badge book 2020 pdf', likely a lure to encourage users to click on the malicious URLs.

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://baarspo.ru/strik?utm_term=cooking+merit+badge+book+2020+pdf PDF link annotation
    • https://cdn.sqhk.co/gizoxemovefi/Xja09ih/nitilax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409420/normal_5ffd1de4a76d2.pdfIn PDF document text
    • https://cdn.sqhk.co/bawijodol/yibtggw/87905117458.pdfIn PDF document text
    • https://cdn.sqhk.co/mikedeto/BlXheJ0/pavotuzibokeb.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/zBr2bhd/vasepetiduzibifemazemap.pdfIn PDF document text
    • https://cdn.sqhk.co/paxepilekot/bCqjfgd/mobile_recharge_number_dena.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446782/normal_600cb550380bc.pdfIn PDF document text
    • http://8gusevshop.website/jefotezamegekudemiboxutklvd.pdfIn PDF document text
    • http://like-store.site/54600407652cqjjp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375210/normal_6030442296f06.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495034/normal_5fdd21c027f83.pdfIn PDF document text
    • http://gladkoe-telo.xyz/xugolipodunovah3k4x.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389568/normal_5fcc75fe3d8f9.pdfIn PDF document text
    • https://jetovalanowu.weebly.com/uploads/1/3/0/7/130739462/vidudijadijaxuk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00010945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10945 5536 bytes
SHA-256: 5dbad757fbe56aba521c9751c36ba8d05989dbb447b32ffe3a50e14245ab11a2
font_01_sfnt_off00011bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFE 11952 bytes
SHA-256: aa13563c3ae58235e9866886fd5b03d60b8111cf136a79fdca1d33e21e828839

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