Malicious PDF — malware analysis report

Static analysis result for SHA-256 435c76ac58ae4f42…

MALICIOUS

PDF

77.7 KB Created: 2021-05-21 03:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 62aaef481c75cfb5ba680eb8fd4d6724 SHA-1: d54c66ef9f6a8ab9a287b6b1d91a2f5d256d4f09 SHA-256: 435c76ac58ae4f42b0f76f03c73abfc841ba880a0353764d3a30b50bf17420f8
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 0.9998

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 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://jumiwimov.ru/strik?utm_term=how+to+qualify+for+bariatric+surgery+nhs PDF link annotation
    • https://bitoranajezope.weebly.com/uploads/1/3/1/4/131453137/bigigagelezumajafi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404753/normal_6025e140da8fb.pdfIn PDF document text
    • https://wikefazopikevi.weebly.com/uploads/1/3/4/7/134715570/nemujutise.pdfIn PDF document text
    • https://suwuvonujijipi.weebly.com/uploads/1/3/4/0/134042364/kalepimid_pujibelaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451229/normal_604b7825a95e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388626/normal_5ffb429f6711a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443617/normal_606c8f662ee5f.pdfIn PDF document text
    • https://mamifamutimas.weebly.com/uploads/1/3/1/8/131871874/ebdc19e27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470688/normal_60132fab4a98e.pdfIn PDF document text
    • https://fomemavinujidi.weebly.com/uploads/1/3/1/4/131414297/539ba785f26.pdfIn PDF document text
    • https://gerukule.weebly.com/uploads/1/3/1/6/131606739/dijumuremig.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/risalenefazozo/factory_reset_dlink_dap-1522.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/como_actua_el_jabon_sobre_el_virus_covid_19.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/94539446534.pdfIn PDF document text
    • https://s3.amazonaws.com/bogeguva/19809792009.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/open_office_free_resume_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/why_is_my_kindle_paperwhite_not_turning_on.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/best_civilization_like_game_android.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/run_bts_variety_show.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/badikofuxenagera.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_off0000f2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A5 5564 bytes
SHA-256: d47c1aece2d0024fc5a001bdc644dcb3f4e8a90f3b69319f5703cd8d016ae42a
font_01_sfnt_off000105a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A5 10412 bytes
SHA-256: 74b7c607e2314ac2cbdabfcd3469816e7b8260972f2c3b87efebbc27609c536f

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