Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc8af805eadd1b8f…

MALICIOUS

PDF

68.5 KB Created: 2021-02-17 12:47:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 06c9f21ca87d7115b5cd49a3ac006262 SHA-1: 6205490c26b7d059a9e7e94efa18763bb6c3b474 SHA-256: dc8af805eadd1b8f61627ce07920e166e42d5ec8dfed8835bf56b22ab812ccbb
192 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, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yafferge.ru/wix?keyword=avakin+life+hack+apk+dinheiro+infinito+2020 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4463788/normal_6029296ef04be.pdfIn PDF document text
    • http://successinyourlif.website/73551059863yeitx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408343/normal_5fe4dd354724f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373511/normal_5ff2260fbadbe.pdfIn PDF document text
    • http://world-wildshop.com/facebook_profile_photo_template0ef0j.pdfIn PDF document text
    • https://cdn.sqhk.co/bulixanejad/bihXje9/advance_car_parking_car_driver_simulator_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480880/normal_602ae54c144cf.pdfIn PDF document text
    • http://helpcenter.business/74662725140sw65k.pdfIn PDF document text
    • https://cdn.sqhk.co/pomijatan/guFEigO/guess_the_word_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373508/normal_5fdc574257ca7.pdfIn PDF document text
    • http://forumapu.iblogger.org/wigodetovu.pdfIn PDF document text
    • http://rodupokikoxozed.22web.org/dujiwipigajejetawazu.pdfIn PDF document text
    • http://barivelovone.22web.org/64130406496.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vozoxutizetu.epizy.com/naruto_shippuden_storm_3_mod_apk.pdfIn PDF document text
    • http://defujusavoxo.rf.gd/boss_tone_studio_manual_gt1.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_off0000cf3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3E 5452 bytes
SHA-256: 7ddfe364bacd57d10e803587c33793d55ddf9f9b92691ed77b4df126b729bbd8
font_01_sfnt_off0000e1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D1 10348 bytes
SHA-256: 8ae21d3f5bdf9492e406bb15390d6c5255ca1d86f1801e166154376fba78da10

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