Malicious PDF — malware analysis report

Static analysis result for SHA-256 be66a2a6cf6415bd…

MALICIOUS

PDF

81.3 KB Created: 2021-04-26 04:36:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: caa406a3dccbe8eb963eab0fe16b7d74 SHA-1: 989638bd8330b30b536c368ed56fb86ed187d684 SHA-256: be66a2a6cf6415bda1f5574ca010f29a85b369c7945735728883c46cd5770772
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://resalured.ru/strik?utm_term=qu%25C3%25A9+es+la+qu%25C3%25ADmica+org%25C3%25A1nica PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4420903/normal_6000749e420d4.pdfIn PDF document text
    • https://palotuzumi.weebly.com/uploads/1/3/5/9/135991270/2063418.pdfIn PDF document text
    • https://pulaberiboz.weebly.com/uploads/1/3/0/7/130775840/1628175.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412899/normal_60589c6b6a4bf.pdfIn PDF document text
    • http://technodom11.com/autodesk_3ds_max_2017_tutoriallg8gh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407784/normal_60394d9853922.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457868/normal_6061f5a7dfd66.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476427/normal_600381b633190.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366009/normal_6006b8885f8b7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405687/normal_60062541cccac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391000/normal_6021550583ad7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458421/normal_602c245ae8892.pdfIn PDF document text
    • http://nature-ital.space/jikelunusojanexigefxj82f.pdfIn PDF document text
    • http://pubgmobiie.com/cant_connect_to_brother_wireless_printergqaq4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384155/normal_60082f44b4004.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462352/normal_605099ae0106b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484633/normal_605efcad788d2.pdfIn PDF document text
    • http://organicnu.info/sulekomapoliditolabaroc7bip.pdfIn PDF document text
    • http://teren.fun/evans_partial_differential_equations_amssj42f.pdfIn PDF document text
    • https://nomikevokatipo.weebly.com/uploads/1/3/1/8/131859895/e32d19fb397f.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_off0000fd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2F 5736 bytes
SHA-256: f82cf6cca56fe62bc4c53e7c6cf1c8d2ed217e8e65e42f1cd62ea0b4d83a97e6
font_01_sfnt_off00010fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBA 12184 bytes
SHA-256: 28ae8d9a00907795d4472c0547a3b4574673bbdc6422a16c1923f35ffd3639f3

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