Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b620596bf4acb06…

MALICIOUS

PDF

82.6 KB Created: 2021-02-17 06:33:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 050f1bac31feca57cc9b783b2b1075a0 SHA-1: 831516f0d8d2efee2922d67f6a869d7125737a71 SHA-256: 1b620596bf4acb0691a9858cdf329a1868adbd184855cc5c7376a3ac24f7d189
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a PDF link farm. It contains numerous external URIs pointing to other PDF files hosted on various domains, suggesting an attempt to distribute malicious content or engage in SEO spam. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • 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/strik?utm_term=what+is+quality+and+safety+in+nursing PDF link annotation
    • https://cdn.sqhk.co/lopumilekana/9hadTNB/vojibudumoxuveles.pdfIn PDF document text
    • https://cdn.sqhk.co/lagazowasobo/FjalBgi/the_third_day_season_finale_explained.pdfIn PDF document text
    • https://nobakavukip.weebly.com/uploads/1/3/4/3/134373074/vikuwitev_lavekes_vusibe_wenujovex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369166/normal_6002b72a24ced.pdfIn PDF document text
    • https://betisifi.weebly.com/uploads/1/3/1/4/131438474/bonimax.pdfIn PDF document text
    • https://cdn.sqhk.co/tepobugu/FgimjeM/4450879167.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425909/normal_5fd1e7d09d0dd.pdfIn PDF document text
    • http://tamakar.tech/sabre_dance_piano_sheet_music2l6hr.pdfIn PDF document text
    • https://cdn.sqhk.co/wufevinek/jdjaUie/recent_technology_news_websites.pdfIn PDF document text
    • https://cdn.sqhk.co/suzeboxiwo/n9gfkhb/planet_fitness_black_card_membership_promo_code.pdfIn PDF document text
    • https://zurudepovog.weebly.com/uploads/1/3/1/4/131438860/3408337.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
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FB 3284 bytes
SHA-256: a337cdc4fedce49cc0700d8434618ae5b92b8bf127df8669d08d63cdf4e8cfb3
font_01_sfnt_off0000f5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CC 5184 bytes
SHA-256: 137a654966ff7e2408bf18c2c1bb58c206f48b6a1eedc84df43a424da470794d
font_02_sfnt_off0001075d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075D 11128 bytes
SHA-256: 7fbe24322257babc8edfd5178c4c63ed52a59439c76273fad77e40e220c90703
font_03_sfnt_off00012d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1E 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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