Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1fc32f1a6f19385…

MALICIOUS

PDF

76.0 KB Created: 2021-03-09 03:19:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 56c56231ca6a59f64f9ed8d8ff842e0c SHA-1: 3128d79aed307e72e4d144113f02d09ea53deb52 SHA-256: d1fc32f1a6f193852c59d26074856f0e3b4e2db127f4f3ca234dd4d27bfc37c1
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://druttle.ru/123?utm_term=test+habitos+alimentarios+pdf PDF link annotation
    • https://cdn.sqhk.co/dujuxafetot/apigChb/international_business_management_salary_in_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/zegofurop/gcd2Ggd/shark_attack_game_online_free.pdfIn PDF document text
    • https://cdn.sqhk.co/xagaxubibiz/aCAXBhg/men_s_ponytail_styles_haircuts.pdfIn PDF document text
    • https://nusoselif.weebly.com/uploads/1/3/4/4/134470887/gevumamokodov_gesiriwe_vejisubexisolon.pdfIn PDF document text
    • https://cdn.sqhk.co/mujowofapubi/9ihjhdk/world_history_quiz_for_high_school.pdfIn PDF document text
    • https://cdn.sqhk.co/sexobivobufo/ghjjjUd/aso_exam_pattern.pdfIn PDF document text
    • https://jowujutaxafekul.weebly.com/uploads/1/3/5/3/135348014/382257c4.pdfIn PDF document text
    • https://cdn.sqhk.co/begokaxawip/lhhjgic/3rd_rock_from_the_sun_3d_episode.pdfIn PDF document text
    • https://cdn.sqhk.co/wefekoferu/82jc0jb/xafoxaf.pdfIn PDF document text
    • https://cdn.sqhk.co/fogobewataja/rjbhcgj/66391743191.pdfIn PDF document text
    • https://cdn.sqhk.co/jogekiluse/ihgegeI/zetovalobalenawin.pdfIn PDF document text
    • https://cdn.sqhk.co/tazuxalana/ohdV6hh/watch_pulling_strings_free_online.pdfIn PDF document text
    • https://cdn.sqhk.co/nudogada/tWahfii/hits_90s_espanol.pdfIn PDF document text
    • https://cdn.sqhk.co/rarirawibowo/haijjF7/flip_master_mod_ios_download.pdfIn PDF document text
    • https://cdn.sqhk.co/fafovewidom/gibrggG/kogubekaraluzexedulawub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://19f621d4-ab03-49b5-bf1d-c78de40104d4.filesusr.com/ugd/bc84a3_46143062f98c4e329e3a78eea675664b.pdf?index=trueIn PDF document text
    • https://c4a5d104-04f9-44e6-b03f-1f5edac3680f.filesusr.com/ugd/f23921_4efe28615e9d4e71987badc1128b479b.pdf?index=trueIn PDF document text
    • https://05e27880-d5e1-4d3d-8428-ba943e9300bc.filesusr.com/ugd/b56239_ab1d8f715a3c42a3a2d2d88088a72d0c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a347c43-dade-436d-a10a-7d566509adc4/how_to_repair_a_panasonic_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2983ef4d-cd65-4845-91fc-a22838f29b4f/cook_once_eat_all_week_vegetarian.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dc92b1c-7b31-471d-8c6d-31137af670ac/ensayo_del_libro_el_arte_de_la_guerra_sun_tzu.pdfIn PDF document text
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_0503d2698a714d95ae83f18dea757343.pdf?index=trueIn 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_off0000ee70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE70 5372 bytes
SHA-256: 2eb8ba2adae934446489ed38b5cc0a33ff481ec04d785c06c526ae35b073b6d9
font_01_sfnt_off0001007b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007B 9996 bytes
SHA-256: b85d62ae1026034f9057a46fc91a2db6f830eff73fa4f496c97de6ecdca8aa70