Malicious PDF — malware analysis report

Static analysis result for SHA-256 558fa5c51c70a991…

MALICIOUS

PDF

76.1 KB Created: 2021-04-25 15:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 24a885df883e019e721dd3fcbddbe35c SHA-1: 59983e19bc264cb3432ad4db078dc3069cddab98 SHA-256: 558fa5c51c70a9913a0ad05b61dceff82af8217d26f6b35da1d18c8c4b70a72c
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 of which point to disposable domains and redirector infrastructure, indicating a phishing or scam attempt. The ClamAV detection and ML classifier further support its malicious nature. The document body, though heavily obfuscated, contains text related to car maintenance, likely serving as a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://yafferge.ru/strik?utm_term=2006+honda+civic+oil+change+interval In PDF document text
    • https://cdn.sqhk.co/vipujitebiki/dgcMH42/clash_of_the_titans_2010_cast_medusa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468836/normal_5ff3f7309faf4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501503/normal_6012253a0ba05.pdfIn PDF document text
    • https://cdn.sqhk.co/soxemudu/ThdJYpC/69350429552.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/cieceLe/fidapufexip.pdfIn PDF document text
    • http://com-copyrighit.com/95209809452nrm23.pdfIn PDF document text
    • http://xitawefavam.medianewsonline.com/88492052685.pdfIn PDF document text
    • https://cdn.sqhk.co/liviberox/lifhfeD/fujiwoxisefinobakagi.pdfIn PDF document text
    • https://cdn.sqhk.co/zinoliwomi/0iahhhb/xemivixiginujusepikiwebed.pdfIn PDF document text
    • http://derilezin.sportsontheweb.net/katawa_shoujo_rin_path.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445745/normal_6033946e18721.pdfIn PDF document text
    • http://reduslim-sito.site/bookmark_file_l_g14hea.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxonewebuke/ibjjd6r/pick_me_up_car_game_online.pdfIn PDF document text
    • http://rankingcoach-seo.com/the_three_pillars_of_zen3dvhz.pdfIn PDF document text
    • https://cdn.sqhk.co/nakunadubux/qjYm8ih/34891170873.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387813/normal_606a43dfa72cf.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/cobKheh/71359052400.pdfIn PDF document text
    • http://organicnu.info/dyson_v6_motorhead_extra_manualfwo3r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ec5c17a1-061e-4a2c-a9e6-b3561ba71229.filesusr.com/ugd/299074_76168f52f32d47198a497933f11284c4.pdf?index=trueIn PDF document text
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_7ad611b6f9bf419fb4b9535079eb0c83.pdf?index=trueIn PDF document text
    • https://d1ee23ee-9ccf-45b0-80ef-1e1ff1f657c4.filesusr.com/ugd/9ef0c3_9978cd70c3d14e1d9d7b0418391742f1.pdf?index=trueIn PDF document text
    • https://e209d09f-5af8-48a0-acfc-72d03e9bea0d.filesusr.com/ugd/946fcc_5aeff959f6a34fa6aa0d4afb1f366238.pdf?index=trueIn PDF document text
    • http://dijejewilibafux.onlinewebshop.net/charles_bukowski_poetry_books.pdfIn PDF document text
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_391c08e7b62d4d9dbd67e52b9eded000.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_off0000ebca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCA 5416 bytes
SHA-256: 0df7073c0e0becc49808fa1c05835e79b285ba2b291b086b5ad3b83d7b836d4c
font_01_sfnt_off0000fe34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE34 11028 bytes
SHA-256: 9472759260882222c1d76899a6171f30880e8202576d3eed6d8c8cff747ed5fd