Malicious PDF — malware analysis report

Static analysis result for SHA-256 94ea67295c070230…

MALICIOUS

PDF

66.8 KB Created: 2021-01-01 10:12:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: ba1bd509acc1e2c8ecde04afb5ef6359 SHA-1: bdfbc2f4230794da9880cc35f36d7e51d914b592 SHA-256: 94ea67295c0702303a49a42e10fa73fe7adac1a1c62aaddb0bc3b23bd310e32f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 distribution attempt. The document contains numerous external links, many of which point to other PDF files hosted on various domains, suggesting a link farm designed to obscure the true malicious intent. The primary lure appears to be a free download for a 'Super Mario Brothers ringtone', which is likely a pretext to drive traffic to these 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://traffnew.ru/strik?utm_term=super+mario+brothers+ringtone+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386609/normal_5f8e74b632fa7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452599/normal_5fcefbe49d655.pdfIn PDF document text
    • https://nenuxigibasus.weebly.com/uploads/1/3/4/6/134694542/9937003.pdfIn PDF document text
    • https://cdn.sqhk.co/muxigatatini/Xg1gdgg/judupow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445745/normal_5fa21c8ac2292.pdfIn PDF document text
    • https://cdn.sqhk.co/xekiparot/gjXijKX/58049645298.pdfIn PDF document text
    • https://botubadixebom.weebly.com/uploads/1/3/1/4/131407995/226f5.pdfIn PDF document text
    • https://fasiwuwazaxeba.weebly.com/uploads/1/3/1/4/131438460/ccf170.pdfIn PDF document text
    • https://sewigemebovoneb.weebly.com/uploads/1/3/3/9/133997870/lipakuvorinanevot.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuvedije/ipmhhhb/sagakodenepevupaxupes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373768/normal_5fad7cacac7d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385412/normal_5fda1e768e762.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_off0000c72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72D 5792 bytes
SHA-256: 84cc670a7849ab79d5ba9872af5da7eacdf51db7c675683b7dfcf12ff89f02c7
font_01_sfnt_off0000dabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABF 10556 bytes
SHA-256: 7e098b37739b2d4f1d2535e591f6905139996d7520c19bfdbbabb8d78ac12367

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