Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3cba41242dcf96f…

MALICIOUS

PDF

70.6 KB Created: 2021-01-28 09:15:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5395dfa4dab6c6190443be775abbe19b SHA-1: fafb849ab1e5da55ffb6bc6dd132a780e01075ca SHA-256: d3cba41242dcf96f45803cdefca397737b6f443c511e8d29269c1f5c678f9bfc
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with several pointing to known malicious redirector infrastructure and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious lure.

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://traffking.ru/wb?keyword=starfish%20animal%20classification In PDF document text
    • http://freshmind.net/697542354074cmas.pdfIn PDF document text
    • http://stikc.xyz/75810955462wqypt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428052/normal_5ffb860aca3df.pdfIn PDF document text
    • http://site-shop.xyz/61089264674okus2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392441/normal_6006710e5005a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497109/normal_5ffc0313c0e99.pdfIn PDF document text
    • http://blockingscenery.com/728206064409szl8.pdfIn PDF document text
    • https://reratuzofi.weebly.com/uploads/1/3/5/3/135346135/nunuwamibi.pdfIn PDF document text
    • http://domavera.ru/dental_assistant_school_near_me_onlinejiwxb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465402/normal_5fe8ab2e5b5c4.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/ib1hjNt/control_center_ios_14_home.pdfIn PDF document text
    • https://cdn.sqhk.co/bepemuno/xkiasig/my_talking_tom_hack_mod_apk_download_apkpure.pdfIn PDF document text
    • http://varietystore.website/24896106636eg4zl.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/fulazelof/report_student_arrive_late_to_school.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/87025950808.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/businessman_movie_all_video_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/344283355.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_off0000d954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD954 5224 bytes
SHA-256: 4a35f6eda700e5a85d8aa32d62439e7e431d69569539172168524a72854f6baf
font_01_sfnt_off0000eaf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF4 10044 bytes
SHA-256: 29c855a6fdd4b2ef1ea8dc13faaea623fc6b037e96bce11b144f1769cc331d9e

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