Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b658696bacb589b…

MALICIOUS

PDF

86.5 KB Created: 2021-03-30 18:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0095807ccf1ef592ea6dd2999944c0b6 SHA-1: 146211927c620e5630a64f2efd671b3cdc1fd8a2 SHA-256: 0b658696bacb589bc496ebd7b213ac9e7c4212ea0dae6c8e011569e51dc0a6d8
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 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/strik?utm_term=is+mineral+wool+flammable PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4502920/normal_6006bc62af979.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379053/normal_600a10f1776b3.pdfIn PDF document text
    • http://bavomobes.22web.org/kumurimutujagusegev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496204/normal_6039f9bca6ec5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412897/normal_602b4c879b8af.pdfIn PDF document text
    • https://cdn.sqhk.co/velijituma/dXiiUgf/77961998964.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368950/normal_6047af82cdc79.pdfIn PDF document text
    • https://miroguwitofenev.weebly.com/uploads/1/3/5/9/135958286/1765566.pdfIn PDF document text
    • https://cdn.sqhk.co/waxipefimafa/hxjbEgj/13428413423.pdfIn PDF document text
    • https://motanufogok.weebly.com/uploads/1/3/1/3/131381166/buxekarogevodenibi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485163/normal_60246c7be7db3.pdfIn PDF document text
    • https://cdn.sqhk.co/sulezudipozi/ajggdlr/20757664298.pdfIn PDF document text
    • https://vunukufe.weebly.com/uploads/1/3/4/6/134640969/julol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465249/normal_603ee0b9a1fd1.pdfIn PDF document text
    • http://rukolofi.22web.org/antimicrobial_susceptibility_testing_protocols.pdfIn PDF document text
    • http://wowirozunofifo.iblogger.org/runekofojuza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370052/normal_5fea3050761b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468571/normal_600debf7d15fe.pdfIn PDF document text
    • https://cdn.sqhk.co/zubejavaxuvu/q9Ljjpc/ragotan.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/jugobimuraje/jnu_admission_form_2019_ba_hons.pdfIn PDF document text
    • http://rujemivegelap.epizy.com/38919844424.pdfIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/farabanu.pdfIn PDF document text
    • http://lazumibuwa.rf.gd/russian_national_anthem_piano_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/92193633200.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_off00011444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11444 5084 bytes
SHA-256: 9fb12c33ee22e943303770a4e96474fc683982c3ec0b884d3c03852366a8eb4d
font_01_sfnt_off00012587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12587 11644 bytes
SHA-256: 63692aa02310c65d6b00ede67d91dc5302ae2d358074b6d322e9ba1f750e8a21

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