Malicious PDF — malware analysis report

Static analysis result for SHA-256 7be3cd47ce38f0e1…

MALICIOUS

PDF

72.8 KB Created: 2021-03-31 07:14:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7eea3a5ca753dbfa49cbb004691e071b SHA-1: 87b3757117daf38dcb11999bdd58f8d54f7045c9 SHA-256: 7be3cd47ce38f0e1b1079fe9d1489a8d4d11a15478aab16849afd8fd567f9260
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 0.9990

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/wix?keyword=chemistry+book+answers+edexcel PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4501356/normal_5fe4cc56504a2.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopaji/jbMGIja/guess_the_movie_character.pdfIn PDF document text
    • https://cdn.sqhk.co/gegenosuzun/bjhJgcp/paxefapevijalalifawuw.pdfIn PDF document text
    • https://cdn.sqhk.co/regisanozoxo/vhfQjex/93832821761.pdfIn PDF document text
    • https://cdn.sqhk.co/gewewoturila/1Q0hihj/13651703339.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446155/normal_605280fc64148.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401517/normal_6041c18d5a96a.pdfIn PDF document text
    • https://cdn.sqhk.co/bilanogakiw/liiibfR/arsenal_etickets_login.pdfIn PDF document text
    • https://cdn.sqhk.co/nemuvefik/Oftieij/matamepokomumibadil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374537/normal_60020ed1a9ae2.pdfIn PDF document text
    • https://cdn.sqhk.co/totarujined/iJnhahh/11587683601.pdfIn PDF document text
    • https://cdn.sqhk.co/jozunufap/ggjeE7z/zidazixo.pdfIn PDF document text
    • https://cdn.sqhk.co/tekonunise/gfhchmN/nikazokimi.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/6c13d9b1-9124-409c-ae5b-651fc0cc1781/do_you_want_to_be_average_blood_pressure_readings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fce3df9-7d88-4d50-a4d3-4e188992e9ca/this_pc_cant_run_windows_10_1909.pdfIn PDF document text
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_780e6265afd94798ab2173d1dcf9cd57.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ee02dc5-59fa-4003-a71b-07b791a27644/how_do_you_calculate_cash_dividends.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/94224833409.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/35156130430.pdfIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/zududufutujikizisoveg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/683e6d01-335a-4094-a8a0-911b364b9f92/53857250813.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/extreme_ownership_how_navy_seals_lead_and_win.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/tupidonu.pdfIn PDF document text
    • https://6376acfe-5884-4251-b3d5-19a03c044549.filesusr.com/ugd/de3d83_c249c578a0e743ed8cd3e39cf4b6aa4e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d18593d-d07d-447b-ab35-bac44601e0cf/best_tech_stocks_under_20.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_off0000dca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA8 5552 bytes
SHA-256: d74556632b3e4f823e7ea98513fefda7f99bbc96991ddf47b10e8c303f13f0a7
font_01_sfnt_off0000ef6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6C 11636 bytes
SHA-256: 58e04d75dfeb54cb6b423fba02b539bc61bd739eff37c645cb227c055f8d356b

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