Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c816661a79581d…

MALICIOUS

PDF

79.4 KB Created: 2021-02-08 02:55:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 4efe92bd26bb4af039a23639b6716d7c SHA-1: 5c00e5a317da81a5161b46e14e985f17d146f4d3 SHA-256: 85c816661a79581d97b491de04297ce1d15a398145825f2498798c1e9a5e9397
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm. 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 URL patterns suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/123?utm_term=corcoran+high+school+colors PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465557/normal_5fd29a0a6e881.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408323/normal_5fffa0b969ee3.pdfIn PDF document text
    • https://cdn.sqhk.co/jidelugob/ghhcgcM/84822397908.pdfIn PDF document text
    • http://tukameduk.22web.org/nopojepu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447880/normal_601e14423c438.pdfIn PDF document text
    • http://sitajejo.22web.org/canine_anatomy_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/tazifawixax/HPgd3q0/how_to_loot_game.pdfIn PDF document text
    • https://cdn.sqhk.co/savageven/hjicNhb/poutine_canada_national_dish.pdfIn PDF document text
    • https://cdn.sqhk.co/duzimisese/hqyjdzv/sodekujav.pdfIn PDF document text
    • https://cdn.sqhk.co/nomazotesi/JQNogjG/35725453076.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476416/normal_5fd0477da78ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465151/normal_5fcf2c01dd1f9.pdfIn PDF document text
    • https://cdn.sqhk.co/tinodifozeza/sIghgde/z_nation_full_cast_season_5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460963/normal_5fdab600c13f3.pdfIn PDF document text
    • https://cdn.sqhk.co/tesadubozino/ahajahe/adobe_photoshop_cs6_camera_raw_plugin_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407085/normal_5ff7f4048b2ee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tinozireru.epizy.com/bhoot_wale_cartoon_video.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/biriyani_tamil_movie_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/breadman_pro_user_manual.pdfIn PDF document text
    • http://gataton.rf.gd/63738980065.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/17324414778.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_off0000ea3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3D 4968 bytes
SHA-256: 76a4e0721153f088c73f85d8870e327927e8af775b066ce3c3d095ba8761cc48
font_01_sfnt_off0000fb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1B 16888 bytes
SHA-256: b49627c0eeceace5ea1bd7e200109493c68f7a4761332736f85ae1fce4675a71

Open this report in the interactive analyzer, or submit your own file for analysis.