Malicious PDF — malware analysis report

Static analysis result for SHA-256 4caaad03c7a6c9ff…

MALICIOUS

PDF

71.0 KB Created: 2021-05-29 17:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a156000da1a5579875b48a13325dbfe8 SHA-1: 8569b45051ff568589fc9a5bc1052b514163ed51 SHA-256: 4caaad03c7a6c9ff00d4df78edaf46d70998160755da954f857849179084f438
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://golowaki.ru/123?utm_term=os+segredos+do+alcor%25C3%25A3o+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413583/normal_5ff02e25a476f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368485/normal_60015212ba494.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475397/normal_6069a1a4c456d.pdfIn PDF document text
    • https://fugazuxelodurip.weebly.com/uploads/1/3/4/6/134639195/sudabagapizin_kogomegamafixe_sikiwidutozamum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463560/normal_605fac5b420d4.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4494888/normal_60b0521f8c476.pdfIn PDF document text
    • https://kovexinuzik.weebly.com/uploads/1/3/0/8/130815277/pesugabala.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469359/normal_5feb43123e783.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454821/normal_6015b64a8b45e.pdfIn PDF document text
    • https://dojulukasinu.weebly.com/uploads/1/3/0/7/130776790/jamosozekazozi.pdfIn PDF document text
    • https://vujewixijul.weebly.com/uploads/1/3/1/4/131437312/jidugusonegowuf-potubowafuxiko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390381/normal_606229a9e4fc1.pdfIn PDF document text
    • https://zirilomeme.weebly.com/uploads/1/3/6/0/136025267/c53696fa322d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412762/normal_602b41c1eace1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495402/normal_5fe35a5d618cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374371/normal_60203771252f7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c297f53f-097b-41bb-aa8d-044049e2448e/78810316929.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2b6622a-ce10-4878-b4f8-848041d2b277/85533092219.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_off0000d3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CE 5668 bytes
SHA-256: f4b22dfdc5799bfd10dd3db8c627ffcc6347b686e0c213a96cba7ce7bd1f0494
font_01_sfnt_off0000e68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68C 12332 bytes
SHA-256: 5a2d5ad70b9cdc4a6e951e9c546f270af1ded1b8d23f1a4adcce0f4d96f66ce6

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