Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4bc77d544733ab1…

MALICIOUS

PDF

71.5 KB Created: 2021-02-22 09:45:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 4a9dd1d5f963240d6f0ea5392076f846 SHA-1: dcec5ffd2548e27e2e921857e976bf8bb3d43949 SHA-256: e4bc77d544733ab166b6962f0518cacd0b282a2769dcc194dcbe8c6d3f2f0b68
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to PDFs. The primary URL, https://jacksth.ru/123, suggests a lure related to 'active and passive voice definition and examples pdf', likely to trick users into clicking through to a network of other PDF links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://jacksth.ru/123?utm_term=active+and+passive+voice+definition+and+examples+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448126/normal_6011946c6cadf.pdfIn PDF document text
    • https://jutoxanifi.weebly.com/uploads/1/3/5/3/135321179/fegomutugoxu_dodidilon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388833/normal_6021bd7d9f2a8.pdfIn PDF document text
    • https://cdn.sqhk.co/gavezexu/1gdxZKu/hardest_game_in_the_world_level_30.pdfIn PDF document text
    • https://jibunomo.weebly.com/uploads/1/3/5/3/135348462/lesimudamexufi_datirax_pozoripur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380522/normal_5fdddcd139243.pdfIn PDF document text
    • https://cdn.sqhk.co/madumubo/Rgcz8JH/nonufotezemezasaru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388619/normal_60263f3084cca.pdfIn PDF document text
    • https://libotavod.weebly.com/uploads/1/3/0/8/130813055/lipafebolorumivewo.pdfIn PDF document text
    • https://medofigovur.weebly.com/uploads/1/3/5/3/135316586/basiferuniravirubo.pdfIn PDF document text
    • https://cdn.sqhk.co/tumowara/PViijii/83385024325.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463266/normal_600f10789ac45.pdfIn PDF document text
    • https://cdn.sqhk.co/xexanodu/gggcjaH/tiktok_creator_fund_price_per_view.pdfIn PDF document text
    • https://cdn.sqhk.co/nutewakizi/fha4zgg/rise_of_kingdoms_the_companion_free_civilization_change.pdfIn PDF document text
    • https://sabumamopadav.weebly.com/uploads/1/3/5/9/135957329/lopujafugexagefe.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/dutuzanob/vopadeviremafogufibag.pdfIn PDF document text
    • http://rebukupomapet.rf.gd/37273461770.pdfIn PDF document text
    • http://fapizof.rf.gd/59294275425.pdfIn PDF document text
    • https://s3.amazonaws.com/legesiliv/71008872875.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/ludaxenezukixa.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_off0000dbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC7 5324 bytes
SHA-256: 571e6420d7118357412ff562612baa4d403ca0094cd806efe849bb0b4fd92c96
font_01_sfnt_off0000ede7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE7 10040 bytes
SHA-256: 3d0159cd6f4ebad83b250f281283e0dd31701d005de1e240158d19a069e6368f

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