Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa071b6377f34dce…

MALICIOUS

PDF

74.8 KB Created: 2021-02-09 01:51:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 25352e0c05a597e0017a17e218d35593 SHA-1: c23bd4af084dcc523769a4fa5db00fd03bfc676c SHA-256: aa071b6377f34dce7195d037324f387d53172aad2bd1a0d2f82c8691cd61a92c
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which are SEO-optimized and redirect to other PDF files, indicating a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious 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://leonvi.ru/123?utm_term=unit+of+inquiry+grade+4 PDF link annotation
    • https://cdn.sqhk.co/fejisedetu/fietggN/amc_stock_buy_or_sell.pdfIn PDF document text
    • http://rukozhop-guide.com/econometrics_short_notesqlsy0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386842/normal_5fe3df228e74e.pdfIn PDF document text
    • https://natizupasa.weebly.com/uploads/1/3/1/4/131437725/kavorikarusimed-tevegas-lireporuz.pdfIn PDF document text
    • https://sikatakidamezor.weebly.com/uploads/1/3/6/0/136086345/xaduzuge.pdfIn PDF document text
    • https://sisilodoja.weebly.com/uploads/1/3/1/4/131406442/terek.pdfIn PDF document text
    • https://cdn.sqhk.co/liweruruzed/gigpVra/60339547015.pdfIn PDF document text
    • http://onlyforyou.space/488261465387i94a.pdfIn PDF document text
    • https://cdn.sqhk.co/vinasujitupe/dliiiAR/zimaluwetebirisadiviripil.pdfIn PDF document text
    • https://nelunozulugekis.weebly.com/uploads/1/3/0/7/130739970/5292d6.pdfIn PDF document text
    • http://neo-tp.ru/caveators_consent_formtf7xy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493867/normal_5fef9f2a2bd96.pdfIn PDF document text
    • https://sidutoxa.weebly.com/uploads/1/3/4/8/134886075/3429729.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/jiwisigetizoxif/12292823210.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/mokogobuguxotufes.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/rijomur.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/79257758365.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_off0000e665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE665 5172 bytes
SHA-256: 3bfe3419cfc46517c67f0fd3bec53f58969c66434d1dddebed688f4110f89f45
font_01_sfnt_off0000f816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF816 11164 bytes
SHA-256: 5466fdbd14c7d7c388de4c1aa733c59935305e1601af9b0fc34afd00f2b31bf8

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