Malicious PDF — malware analysis report

Static analysis result for SHA-256 648616abb9ab2156…

MALICIOUS

PDF

77.2 KB Created: 2021-01-28 01:08:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 781ad0c023a3f4802c8e9a1c35c990f3 SHA-1: 23e035b47fefa220f0bf147b6fe643aba57a3a34 SHA-256: 648616abb9ab21561f4d86c644b5a71827ed5f603af3414aa00f289662d7c059
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which are SEO-optimized and lead to redirectors or other PDF files, suggesting a link farm or phishing campaign. The primary URL, 'https://druttle.ru/123?utm_term=small+estate+affidavit+arizona+maricopa+county', appears to be part of a lure to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://druttle.ru/123?utm_term=small+estate+affidavit+arizona+maricopa+county PDF link annotation
    • http://tajoraf.22web.org/74327448252.pdfIn PDF document text
    • https://xaziribubeka.weebly.com/uploads/1/3/4/3/134397614/nidon.pdfIn PDF document text
    • https://vigekajabaka.weebly.com/uploads/1/3/4/7/134708837/xosujurowitegib.pdfIn PDF document text
    • https://cdn.sqhk.co/nolagutotato/hhidtBf/noxatebupiveguvo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492259/normal_5fc6b366acbf4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381318/normal_5fcfb8118e8cf.pdfIn PDF document text
    • https://cdn.sqhk.co/wavudasawete/jjgdXGG/69340159336.pdfIn PDF document text
    • https://vemisalisak.weebly.com/uploads/1/3/1/4/131437925/2d22d2c14.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409609/normal_5fe534f99689d.pdfIn PDF document text
    • https://rejonogatu.weebly.com/uploads/1/3/5/3/135392998/8997167.pdfIn PDF document text
    • https://nozezekotelipub.weebly.com/uploads/1/3/4/8/134883262/nibedekevalinex-bipetezugag.pdfIn PDF document text
    • https://degiviwab.weebly.com/uploads/1/3/2/6/132680905/6782700.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490739/normal_6008af2e7f86d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mujasanowagug.epizy.com/minecraft_herobrine_skin_pe.pdfIn PDF document text
    • http://muvipifipu.rf.gd/87769844532.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF081 5616 bytes
SHA-256: 86ee13c75ad91b283a7e9e28b6433f9a3734f6bf85d0f4f7e4baf3a8245bc108
font_01_sfnt_off0001039b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039B 10516 bytes
SHA-256: f91ba2498ecddea5249e5d9f395998a9c3f80d90cc14251f644ee4f955132338

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