Malicious PDF — malware analysis report

Static analysis result for SHA-256 f66d203dabc6759c…

MALICIOUS

PDF

81.1 KB Created: 2021-02-24 13:28:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 116ccd4635653d6e1e93734c792418ca SHA-1: 9e237ab5f60801e609c35ff748100d3c77f767c6 SHA-256: f66d203dabc6759c250c34a4937e294ec5dff906ba5456c47643509a2dfb2478
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with critical heuristics indicating it functions as a malicious redirector and a link farm. One of the primary links, 'https://crophysi.ru/strik?utm_term=fujitsu+scansnap+s1500+driver+download+windows+8', is flagged as a malicious redirector. Another link, 'http://vk-settings-change.online/xukumeripakami1bkg.pdf', is part of a link farm, suggesting a broad attempt at SEO poisoning or distributing further malicious content. The ML classifier and ClamAV detection strongly support its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/strik?utm_term=fujitsu+scansnap+s1500+driver+download+windows+8 In PDF document text
    • http://vk-settings-change.online/xukumeripakami1bkg.pdfIn PDF document text
    • https://lagipadule.weebly.com/uploads/1/3/5/3/135301279/974067e34ff3.pdfIn PDF document text
    • https://gewilowada.weebly.com/uploads/1/3/0/7/130776716/02e3a.pdfIn PDF document text
    • https://fudegenajeno.weebly.com/uploads/1/3/4/5/134581691/b944f6ff1829.pdfIn PDF document text
    • https://cdn.sqhk.co/jexozumumanu/hjggjd4/87049784673.pdfIn PDF document text
    • https://cdn.sqhk.co/gulifunanale/ahajhhj/bubble_pop_puzzle_game_legend.pdfIn PDF document text
    • http://upgrade4me.com/nabotalixikakatqbvgt.pdfIn PDF document text
    • https://noxagutut.weebly.com/uploads/1/3/4/4/134483949/1609350.pdfIn PDF document text
    • https://cdn.sqhk.co/sidamebo/hbSjjgf/party_music_2020_list.pdfIn PDF document text
    • https://cdn.sqhk.co/vitikitema/3PghhWt/zombie_killer_clicker_download.pdfIn PDF document text
    • https://pirubanulap.weebly.com/uploads/1/3/4/8/134847944/3155251.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jubiferekaka/66383059540.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/79529453429.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/centre_europen_de_formation_avis_emploi.pdfIn PDF document text
    • https://s3.amazonaws.com/resisuna/zibupi.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/biological_science_pearson.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_off0000edca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCA 5644 bytes
SHA-256: 55192e2163a593335ba42e611d02caa8c381d5e20081c7280481c787cdd7460a
font_01_sfnt_off00010120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10120 11812 bytes
SHA-256: 0ca7940cea24c83bcb7aa7440f5140e1003478ce07d816ef8ec6838c0838b0db
font_02_sfnt_off000128ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CE 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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