Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae95a3a85ce5de4c…

MALICIOUS

PDF

72.9 KB Created: 2021-05-31 16:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d879e02c18a580443c5b0aacb675b091 SHA-1: 3aae654affab083a4380692cc56525d3e8dbf7c2 SHA-256: ae95a3a85ce5de4cb3d00d1777abb3031f125250d4a8a51da7209733c2f9cad9
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 0.9997

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://oniceh.ru/pbw?utm_term=cellular+respiration+experiment+with+yeast+and+methylene+blue+lab+report+introduction PDF link annotation
    • https://laxigotugib.weebly.com/uploads/1/3/0/9/130969680/lorefodijif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477651/normal_5fdc9e666ad28.pdfIn PDF document text
    • https://bidegibi.weebly.com/uploads/1/3/4/4/134476665/4914051.pdfIn PDF document text
    • https://jafobepajimo.weebly.com/uploads/1/3/4/8/134881918/8144514.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374542/normal_60195022a92dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417039/normal_6039da5d218e0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482625/normal_5feb176a35752.pdfIn PDF document text
    • https://pufedoxavode.weebly.com/uploads/1/3/4/6/134613169/6409716.pdfIn PDF document text
    • https://jixinedoxe.weebly.com/uploads/1/3/1/3/131383771/c3e74d79b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418985/normal_5fc6d8661bb7b.pdfIn PDF document text
    • https://pozugawejebi.weebly.com/uploads/1/3/4/6/134610366/vimaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409238/normal_5fe75dbfcd373.pdfIn PDF document text
    • https://zapineri.weebly.com/uploads/1/3/4/7/134707132/5468f960af97.pdfIn PDF document text
    • https://nepexinis.weebly.com/uploads/1/3/1/4/131438592/174b08cd50f0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487665/normal_606d23b3066aa.pdfIn PDF document text
    • https://temabodanifow.weebly.com/uploads/1/3/1/4/131454916/tenibokuko-rojivazi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nusuwoxub.pbworks.com/f/93668997933.pdfIn PDF document text
    • http://visetululiv.pbworks.com/f/ponaru.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/f/43454171264.pdfIn PDF document text
    • http://jesababa.pbworks.com/f/what_does_service_due_soon_a12_mean.pdfIn PDF document text
    • http://nagomax.pbworks.com/w/file/fetch/144412542/lusaboxodawitima.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_off0000de5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5C 5620 bytes
SHA-256: 4121c82a3b0023e1f6895d91d8c1a414f534278ad9f3cc6fb581ac72095c7d1a
font_01_sfnt_off0000f164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF164 10512 bytes
SHA-256: cffb60d9a5b6c12a7f16511320f42a4feb5dc1952ac4983f5aa1d69de1463b66

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