Malicious PDF — malware analysis report

Static analysis result for SHA-256 3094ba4137e27e34…

MALICIOUS

PDF

69.3 KB Created: 2021-02-15 22:27:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 464daaf4bf00f3aacbf9cb884c240456 SHA-1: 9f6f2ba5010f9f18fc6b80497c47cab27ce458c2 SHA-256: 3094ba4137e27e348371d7bd5a562f57221781e81449e78c7fbb87dc98b18f84
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains embedded links pointing to known malicious redirector infrastructure, such as 'https://yafferge.ru/wix?keyword=my+chase+schedule+app+for+employees'. The document body, though heavily obfuscated, suggests a lure related to employee applications or schedules, aiming to trick users into clicking the malicious links. The presence of numerous disposable domains and link farms further supports a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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=my+chase+schedule+app+for+employees In PDF document text
    • https://static.s123-cdn-static.com/uploads/4479223/normal_5fee6fa976a5c.pdfIn PDF document text
    • https://cdn.sqhk.co/wasuxuletiz/jjcyjd7/tepatirizowu.pdfIn PDF document text
    • https://cdn.sqhk.co/xufojidaju/ULiaidh/bbc_songs_of_praise_hymn_book.pdfIn PDF document text
    • http://hookup757.fun/annihilation_jeff_vandermeer_fre55w9j.pdfIn PDF document text
    • https://cdn.sqhk.co/pawijilabu/0s6gjfc/moxofisigarumuvedu.pdfIn PDF document text
    • https://cdn.sqhk.co/tatogevi/8ricapj/204159109.pdfIn PDF document text
    • http://universityru.fun/nuvujg7t5g.pdfIn PDF document text
    • https://cdn.sqhk.co/giravopakiw/3mhb9gj/twitter_search_people_s_tweets.pdfIn PDF document text
    • http://realnoe-obshenie.online/wemedemuderogfvuv3.pdfIn PDF document text
    • http://3bki.ru/90059418903bz71o.pdfIn PDF document text
    • http://bt-management.website/angaraka_runa_vimochana_stotram_in_telugu27q1b.pdfIn PDF document text
    • http://copalofa.site/los_angeles_olympics_2028_transportationt93un.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/ghaggdT/video_downloader_for_opera_browser_android.pdfIn PDF document text
    • http://stassikorskyi.com/minority_report_netflix_canadat7ax4.pdfIn PDF document text
    • https://cdn.sqhk.co/gitaligido/heib0ii/84929832657.pdfIn PDF document text
    • https://cdn.sqhk.co/pimibopugugo/Tsi5QZf/victory_day_russia_parade.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://mychaseschedule.jpmchase.com/In 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

Related samples 3

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF99 5500 bytes
SHA-256: 193a4a0542cb15af0700c90c8edd027a89d441262d8a8531ac0196f69b6bf43f
font_01_sfnt_off0000e23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23D 11232 bytes
SHA-256: d3857ab3cd9601127982afb204194c838f0440985dda27f9408aff1f30cd9eac

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