Malicious PDF — malware analysis report

Static analysis result for SHA-256 70f7fdde89f331f4…

MALICIOUS

PDF

72.5 KB Created: 2021-03-22 22:49:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9d57cde49a3124904b35cd352f71729e SHA-1: 233debb93bb8215eff6a9142d1643534532c2b84 SHA-256: 70f7fdde89f331f42f82295f556a38222c38df1604790e06bf0df99e22dd7c3f
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://nipisod.ru/strik?utm_term=maytag+bravos+7.0+electric+dryer+reviews PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4422386/normal_5fdf892e4bd46.pdfIn PDF document text
    • http://fanilobepewe.sportsontheweb.net/canada_post_international_letter_address_format.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376120/normal_5fe1195ff34c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479474/normal_5fd7f14dadfd7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405904/normal_5ffdc4dd719a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457590/normal_5ffe7e6672e2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464083/normal_601f1d28e9d6d.pdfIn PDF document text
    • http://mimisijuz.mypressonline.com/weight_calculator_formula.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379742/normal_600e39a899424.pdfIn PDF document text
    • http://bidimiw.sportsontheweb.net/newsweek_magazine_pakistan.pdfIn PDF document text
    • http://tizigigukaj.22web.org/10773367057.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482228/normal_5ff9ec044fc9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453901/normal_605527694c996.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377371/normal_604048d2d689a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://79d86aa2-23c4-4aa0-a0dc-c16ac59ae55d.filesusr.com/ugd/ecb701_07b0af1a79294932a415891e2714447c.pdf?index=trueIn PDF document text
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_162332747d5e4d9bb29dc7211f396a7f.pdf?index=trueIn PDF document text
    • http://varebifadilo.epizy.com/83366185550.pdfIn PDF document text
    • http://wudumiwetoveri.rf.gd/mercury_110_9.8_fuel_pump.pdfIn PDF document text
    • http://xofaxisenulomav.epizy.com/atelier_totori_endings_guide.pdfIn PDF document text
    • http://gonuwufif.epizy.com/anbe_peranbu_song_female_voice_ringtone.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_off0000da58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA58 5760 bytes
SHA-256: cf304abc20b43c4246f791cb0c655d5e3444e6d41eb56d3012bf10ca932589da
font_01_sfnt_off0000ee34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE34 11348 bytes
SHA-256: dd2a1fd243d76f4b1db90e1de2cda539ade0e904bd41717fac990c938dc8775c

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