Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6b433e8e9ac72f5…

MALICIOUS

PDF

79.4 KB Created: 2021-03-30 21:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b21794e6574038c0fb4e1941fd2458c2 SHA-1: 20db8b226bbcf02a092141ca4d6ddf68cb80525c SHA-256: b6b433e8e9ac72f5bd36dc38fd77815bcc67c2a8289efdc9e36bc1c3df346a02
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://bologen.ru/123?utm_term=engagement+ring+shopping+guide PDF link annotation
    • https://rezedutusijilik.weebly.com/uploads/1/3/2/7/132710703/bodinenikarevinol.pdfIn PDF document text
    • https://gesefamuredoxuk.weebly.com/uploads/1/3/4/6/134631359/duvisotawaso.pdfIn PDF document text
    • https://gidepojijozi.weebly.com/uploads/1/3/4/2/134235950/ferozizejizujejat.pdfIn PDF document text
    • http://wiinorama.website/sony_xplod_1300w_subwoofer_rojohvkg5.pdfIn PDF document text
    • https://varupeneg.weebly.com/uploads/1/3/0/9/130969993/4f9ec2ef465f4cd.pdfIn PDF document text
    • https://sarutofujatazix.weebly.com/uploads/1/3/4/5/134584212/genilos.pdfIn PDF document text
    • https://lomobesozav.weebly.com/uploads/1/3/0/7/130774973/midijinufijowo-jazafebeb-rizutumale.pdfIn PDF document text
    • http://reduslim-siteofficial.site/sony_bravia_tv_remote_app_for_androidemrad.pdfIn PDF document text
    • http://f13x.xyz/8449126954400f5a.pdfIn PDF document text
    • http://maslovauto.ru/price_for_stihl_ms170o9uu6.pdfIn PDF document text
    • https://talovilivakalod.weebly.com/uploads/1/3/5/3/135326419/7a9bdcff.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/zexozavo/animal_farm_character_chart_worksheet_answers.pdfIn PDF document text
    • https://a6053a4b-6066-498d-92a8-7748b68531bc.filesusr.com/ugd/5f0d2f_04ea7f4bc5bf4dd098f76c28cbac630a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c322ffe0-e4c0-460d-b7f8-37602b540dc3/93605905847.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6249c14a-ee93-43d1-aa42-ea187d37be96/fafoxajitetox.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/99451684551.pdfIn PDF document text
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_bc56776a95bf477eae76755bb1e91c40.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/suximawo/bahubali_1_full_movie_1080p.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/82830844678.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/930e9618-ca74-4341-950f-c1d3d1b38669/60038903268.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/gidowumezuxifazukanazalov.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_off0000f929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF929 5300 bytes
SHA-256: 76243d45076c3179af0abd9100ecb82ba92deb18f9acc33c15e62ce625e97a85
font_01_sfnt_off00010b09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B09 11076 bytes
SHA-256: d27ba1cfa6d8035f5af903d53274d18aad5f5ca73b64cdb5fd48e5faf99781f6

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