Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a1711691830891b…

MALICIOUS

PDF

78.7 KB Created: 2021-03-20 19:57:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 11a20511b19efef875a169c506bc7e26 SHA-1: 6ebd9e99c752dd08f0bfea2b3c5fa7700d0ab506 SHA-256: 0a1711691830891bee0b64fe70e5255988b4420315517a2ecdc09264ffb5cb39
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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 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.
  • 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/wix?keyword=strategic+staffing+3rd+edition+pdf PDF link annotation
    • https://cdn.sqhk.co/loganidob/rOAjgMc/72310848035.pdfIn PDF document text
    • http://biweekamnf.com/celebrate_recovery_lesson_16_questions8gj75.pdfIn PDF document text
    • http://avtoshkola-region26.ru/rca_dta800b1_universal_remote_codesehu3p.pdfIn PDF document text
    • https://wifenawejiwatu.weebly.com/uploads/1/3/4/8/134879118/5439066.pdfIn PDF document text
    • https://cdn.sqhk.co/fapolokid/jcggjja/82228189959.pdfIn PDF document text
    • https://wadenipix.weebly.com/uploads/1/3/1/4/131408068/kevevezi.pdfIn PDF document text
    • https://cdn.sqhk.co/najafizox/ihhifhd/curvy_punch_3d_mod_apk_an1.pdfIn PDF document text
    • https://vurerabekude.weebly.com/uploads/1/3/4/4/134493837/3815bcd9.pdfIn PDF document text
    • https://cdn.sqhk.co/gejixoneku/3eNlcQF/guide_to_get_gems_in_dragon_city.pdfIn PDF document text
    • https://filekudop.weebly.com/uploads/1/3/4/0/134017403/dulibujirupufom-walala.pdfIn PDF document text
    • https://sodomolu.weebly.com/uploads/1/3/5/3/135398587/supefifizujenik.pdfIn PDF document text
    • https://roxagidu.weebly.com/uploads/1/3/4/7/134748987/6372972.pdfIn PDF document text
    • https://zonozedu.weebly.com/uploads/1/3/0/8/130874021/ketufutav.pdfIn PDF document text
    • http://price-list.moscow/how_does_kaneki_diegt55y.pdfIn PDF document text
    • https://vewutuzukep.weebly.com/uploads/1/3/2/8/132815207/9058699.pdfIn PDF document text
    • http://helps-lnstagramcopyrights-about.com/work_energy_and_power_problems_and_solutionsvjdkf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9740e3ff-aeee-479c-b5d1-05920f9f05fa/zazuparesidum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8a8eca8-8129-4a72-81f6-cc2300433a56/pokemon_red_map_minecraft.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff8fc70c-5e8a-4460-8f22-ebc7433556c2/ny_road_test_requirements.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d7779ab-6fa2-4111-b099-ac6b798f23ac/958870444.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17736755-79ed-4054-8e2c-314997cf4b81/69472047610.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42fc9779-dffb-4874-8d8b-63477e8ef461/icewind_dale_2_mod_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81b726dc-c8cb-48b8-b156-cf978bb0cb20/html_css_visited_link_color.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9e9319d-0472-4331-bc6d-b52751cecee2/the_ultimate_idiot_test_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cff68de6-99bf-4415-98d0-d55df86da451/amp_triplex_9200_rs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3badb11c-d906-4e5b-a138-3ef019212f34/introduction_to_java_programming_11th_edition_quiz.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_off0000f0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D9 5556 bytes
SHA-256: 84e6c825073a82bf1ebb02875625a0dcb8ed7ba010373689d558d3f2ffa70e62
font_01_sfnt_off000103d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D8 11524 bytes
SHA-256: 1fee88cb46ee20c2efe852e5c7c56d8cb1b2b5cbdddebc3772a1a5085dbfe619