Malicious PDF — malware analysis report

Static analysis result for SHA-256 85ef33725ddbc399…

MALICIOUS

PDF

68.9 KB Created: 2021-02-19 04:32:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7056fb80ddc4faef0eaff0b7e12c52d8 SHA-1: c809d239282e20010230eace0939e6fd8e86cf9e SHA-256: 85ef33725ddbc3995ba32f8c3909695880bd5c8c56c1e0ddd3abdfd5c64d7203
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://maypoin.ru/123?utm_term=who+made+the+first+basketball+shoe PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4375528/normal_5ff5bc91bec52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501214/normal_601485a399cc7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484363/normal_5fd05195ec045.pdfIn PDF document text
    • https://mipapipav.weebly.com/uploads/1/3/4/0/134012398/xilejatodamuzox_depob.pdfIn PDF document text
    • http://wagugekewa.22web.org/wafuzipole.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/zeworibuzoza/hair_bow_making_templates.pdfIn PDF document text
    • http://divojeniro.epizy.com/86389270985.pdfIn PDF document text
    • http://japorivexasore.epizy.com/pixaj.pdfIn PDF document text
    • http://kiwozoma.epizy.com/bhikshuk_kavita_questions_and_answers.pdfIn PDF document text
    • http://suvapik.epizy.com/supermarket_flowers_easy_piano_sheet_music_free.pdfIn PDF document text
    • http://dinopug.epizy.com/irritable_bowel_syndrome_guidelines_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/32228056623.pdfIn PDF document text
    • http://rodigosixe.rf.gd/parsec_android_keyboard_and_mouse.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_off0000d0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E5 5364 bytes
SHA-256: 37a56543f5a607402e5df8ec1ccf50e50c85a91aa42088879f43e48019daadec
font_01_sfnt_off0000e301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE301 10512 bytes
SHA-256: d2a928be8e991b4772592513ba910d7446ae1554ae1b3bad9f6253bd23db7b4f

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