Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d7b53c2fd01164f…

MALICIOUS

PDF

76.2 KB Created: 2020-11-10 07:01:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c172b1b0e60d3404608e425cba709826 SHA-1: 7bf4cc39c74914988ddb521556664998b268682b SHA-256: 5d7b53c2fd01164f62be169887874e724e7c730784f6bdaaedc622b4c9d0fe5e
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://traffset.ru/123?keyword=plasma+circle+cutting+guide PDF link annotation
    • https://buveziketi.weebly.com/uploads/1/3/1/3/131398526/lexajuxuwedupu_gefajinuvuf_nofuwekinafe_pimedi.pdfIn PDF document text
    • https://xaxaguxoludu.weebly.com/uploads/1/3/4/5/134519627/petumupalot.pdfIn PDF document text
    • https://dililoperajat.weebly.com/uploads/1/3/4/6/134631443/vofaliletibaloviveba.pdfIn PDF document text
    • https://fupefasupemeze.weebly.com/uploads/1/3/4/3/134315788/monafefif_bitop.pdfIn PDF document text
    • https://goresizusozal.weebly.com/uploads/1/3/4/5/134524816/zigega-mozosarufit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413696/normal_5f951c31e9db9.pdfIn PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/zawejejazi-tagen-gegoki-daropipapusu.pdfIn PDF document text
    • https://lafawifovetin.weebly.com/uploads/1/3/4/3/134369932/fobajezonanozotoruk.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/24f4f448-51a8-43c3-85a5-4b0b8d82649f/xofonotukelozozofuguka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e014e95b-7888-4f20-b2e6-db8a8bf490ea/multiplication_tables_worksheets_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7de927d3-ae80-4529-8bc8-5c7de6df93b9/path_of_exile_prophecy_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e54a794-d06a-4cea-b84c-6fd0e6bcb376/national_treasure_2_full_movie_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12ec532b-0173-43c9-8919-ca92eb69621c/7184074988.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/856d8522-f226-474f-969f-879e589b9751/11506025705.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64a229b7-0f00-4322-b76f-4c8188a11347/25912073288.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf3bb05a-5096-46b2-8afd-5546f8a52e65/children_of_thunder_wiki.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_off0000df91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF91 5260 bytes
SHA-256: d81308313d8f56e937f603948daa8eb69a67635830c84562143e74e49d82f21f
font_01_sfnt_off0000f157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF157 15624 bytes
SHA-256: 8e7778da68a2b29481fa37ac05003dc68553827e767ebf3fff67d2faab65c6f1

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