Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c78ec29a04bb7d8…

MALICIOUS

PDF

77.7 KB Created: 2021-03-30 09:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 728bca3098cd1316d17037392805650c SHA-1: e06e485314cbffb696992bce63466bfb4968868a SHA-256: 2c78ec29a04bb7d892d8aba77fe7e3b0de1259e54a423c50e6d797c025d06abd
156 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 5

  • 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.
  • 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://zajinet.ru/123?utm_term=bare+trees+primary+school+ofsted+report PDF link annotation
    • http://avto-document.site/64162533265p3mz9.pdfIn PDF document text
    • https://wosumugip.weebly.com/uploads/1/3/4/8/134867897/246b4f1cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379601/normal_605f2b8a3dfcb.pdfIn PDF document text
    • https://bifuwesulowun.weebly.com/uploads/1/3/4/3/134308915/jijoxugezo.pdfIn PDF document text
    • https://jivetigaforivuj.weebly.com/uploads/1/3/4/3/134350389/jamefowelowit.pdfIn PDF document text
    • https://gematisi.weebly.com/uploads/1/3/4/5/134599806/bagimejagavamiluf.pdfIn PDF document text
    • http://guitar.su/how_to_use_bosch_300_series_dryerlearc.pdfIn PDF document text
    • http://jezopapurowejen.22web.org/12062174698.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379046/normal_60502e27ea955.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/nuvukivaxiren/borderlands_1_xbox_one_digital.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/jasuseponerug.pdfIn PDF document text
    • http://samarusoreris.epizy.com/91282190824.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/19684471007.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/holika_holika_sheet_mask_review.pdfIn PDF document text
    • http://labutebumir.rf.gd/jegasoxoguzebe.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/cobra_15_band_360_laser_codes.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/wugorideme.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/fagazuse.pdfIn PDF document text
    • http://filexumif.epizy.com/82081547829.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/440691995.pdfIn PDF document text
    • http://xexosekijifakam.epizy.com/52037506415.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_off0000f219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF219 5544 bytes
SHA-256: 2d3dbdbd4973cb4566f02d599933fcc3b045a1453e93708d48bc615f052e4b55
font_01_sfnt_off000104d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D2 10752 bytes
SHA-256: 1cdcfa77a9775f68fe5d03b0f63a98b9922086dcaabf562f4f43c7b7eae957ae

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