Malicious PDF — malware analysis report

Static analysis result for SHA-256 d521d2a7594ba75e…

MALICIOUS

PDF

74.8 KB Created: 2021-04-05 09:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: bb02add76aee4331e9562b48fa9aa2d4 SHA-1: 551a5cd98ca8e7dd34bf1111d5c6491d504f7514 SHA-256: d521d2a7594ba75e682a9f0e114e81eb07cd2e243e8382035edc6f8beb5e4ab7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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://dugedepap.ru/strik?utm_term=garmin+forerunner+920xt+hrm PDF link annotation
    • http://stonersfranchise.com/grade_2_math_worksheets_canada_printable0upp5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391317/normal_60174c08cff65.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424349/normal_5ffe74352d218.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469126/normal_600b7c039edf8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454973/normal_5fcb48cb01c85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374022/normal_603f231693964.pdfIn PDF document text
    • http://helplnstagramcontact5087423.com/bobiturogufolimipojezdcnco.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417414/normal_6001566e6505a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454286/normal_5ffc4aa532d5d.pdfIn PDF document text
    • http://titoto.xyz/metodologa_formal_de_la_investigacin_cientfica29miu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450337/normal_6027dcdfae6a8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501991/normal_5ffa6131f30b2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sidakofonol.epizy.com/quadratic_formula_word_problems_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/plato_republic_book_5_analysis.pdfIn PDF document text
    • http://tivekanudoz.rf.gd/bespoke_careers_salary_guide_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/lusegokaves/39293942769.pdfIn PDF document text
    • http://xuboxigaxa.rf.gd/fijebeb.pdfIn PDF document text
    • http://firotiz.epizy.com/goodwill_donation_valuation_guide_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/ruger_sr9_vs_sr9c_dimensions.pdfIn PDF document text
    • http://surobufalinaxis.epizy.com/justin_bieber_all_songs_lyrics.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_off0000e525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE525 5324 bytes
SHA-256: efd026337523e89b70f23073d70f45e32854be92d2cdf3cbf74e5b8e8d1f43a7
font_01_sfnt_off0000f71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71C 11640 bytes
SHA-256: 4838f387290cb9a5ebbe76f19e64708cba8b540d85d3806d0c4767511e9dde22

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