Malicious PDF — malware analysis report

Static analysis result for SHA-256 c890ef9acaaa6b1a…

MALICIOUS

PDF

79.1 KB Created: 2021-02-20 13:48:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: c1e4b7eddd107b8b7bba2aa02f9400ea SHA-1: a6c518d8098795d02e85701a3cb2484e5d915e13 SHA-256: c890ef9acaaa6b1aef6fcb9e77b28e19a876e50b70b382132413d2bdce25db97
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains, designed to redirect users to external content. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM indicate this is a link farm, likely for SEO manipulation or to host malicious content. The ML_NYX_PDF_MALICIOUS and ClamAV detections confirm its malicious nature, with the embedded links serving as the primary attack vector.

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 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.
  • 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://crophysi.ru/wix?keyword=jurassic+world+alive+apk+download In PDF document text
    • http://nesobaka3.xyz/active_and_passive_voice_exercises_present_tensem0ruw.pdfIn PDF document text
    • https://xapotitiguwux.weebly.com/uploads/1/3/4/6/134668809/rebalaje_dipusugimogo_minewa_wawolabapamod.pdfIn PDF document text
    • https://cdn.sqhk.co/simunenij/hfghjfk/gafepewetu.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/ph0nigF/godus_voyages_3_stars.pdfIn PDF document text
    • http://fsfsfd.xyz/idsa_c_diff_guidelines_2017hu31u.pdfIn PDF document text
    • http://tlgfree.xyz/petite_formal_dresses_asosmkk4j.pdfIn PDF document text
    • https://gebawifu.weebly.com/uploads/1/3/1/4/131483167/855f8dbf2af.pdfIn PDF document text
    • https://cdn.sqhk.co/joduragenep/79hcghP/general_hospital_spoilers_scoops_and_rumors_today_news.pdfIn PDF document text
    • http://itclick.info/hp_probook_4530s_specsn8r8q.pdfIn PDF document text
    • http://jolujunutido.iblogger.org/barsega_sawan_song_free.pdfIn PDF document text
    • https://cdn.sqhk.co/wovenebi/jbiaIjd/40902963659.pdfIn PDF document text
    • https://cdn.sqhk.co/beratinuga/idicjaE/fear_the_walking_dead_zombie_origin.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/kagedatabujo/witok.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/best_alarm_ringtone_for_mobile.pdfIn PDF document text
    • https://s3.amazonaws.com/taturi/65270997681.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/pokemon_go_regice_raid_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EC 4444 bytes
SHA-256: 26a2659868e3db3b1c5c52b573c64f250ebaa8a8f24a3cfb68c37e7010a2e680
font_01_sfnt_off0000f070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF070 5272 bytes
SHA-256: 5fe474317ad080c5902acd7282d0de4a2aa7e1f4a66ad4940ea77119f5730e17
font_02_sfnt_off00010281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10281 14060 bytes
SHA-256: 670b18692016279810f49da64198c3e725e08e32c7062a5ed5ea855a1153fe6f

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