Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5c75ed66aee8de7…

MALICIOUS

PDF

82.3 KB Created: 2021-03-01 22:23:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: def3aaceb5bfdb1bb350dfa319504e77 SHA-1: 4437248cdf39c54e88255ff6aadca2bdd9ed0708 SHA-256: d5c75ed66aee8de7a55ed8b8e2bd398ea24c6597287a6e52e7c22df59c1c7674
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, characteristic of a link farm. The embedded URL `https://nipisod.ru/strik?utm_term=shakespeare+quotes+what+fresh+hell+is+this` suggests a phishing or scam attempt disguised as search results. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/strik?utm_term=shakespeare+quotes+what+fresh+hell+is+this PDF link annotation
    • https://cdn.sqhk.co/gusiloxi/ihfghgf/50457835224.pdfIn PDF document text
    • https://cdn.sqhk.co/kixituvelil/hagj4hj/uphill_rush_3_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/kufalavoxig/jcPjhvx/93129777733.pdfIn PDF document text
    • https://tulugawaluga.weebly.com/uploads/1/3/0/9/130969515/8ba4a027218444.pdfIn PDF document text
    • https://cdn.sqhk.co/poronujefino/heoDkpp/87530894526.pdfIn PDF document text
    • https://cdn.sqhk.co/wuluzajiroz/dibhbib/mimpi_gigi_taring_atas_bawah_copot.pdfIn PDF document text
    • https://cdn.sqhk.co/siwowoso/TjbMghY/offroad_racing_3d_2_apk.pdfIn PDF document text
    • https://tazapupexon.weebly.com/uploads/1/3/4/6/134634001/vodixupu.pdfIn PDF document text
    • https://cdn.sqhk.co/rujiwujik/Tjbggjc/dinosaur_battlegrounds.pdfIn PDF document text
    • https://niwogowepovem.weebly.com/uploads/1/3/4/7/134767936/3117511.pdfIn PDF document text
    • https://fanarise.weebly.com/uploads/1/3/4/3/134377412/8099809.pdfIn PDF document text
    • https://rajitogo.weebly.com/uploads/1/3/4/3/134377965/7e80426.pdfIn PDF document text
    • https://cdn.sqhk.co/vilonunufuk/Xohi9ja/python_set_pop_time_complexity.pdfIn PDF document text
    • http://fafuzum.sportsontheweb.net/political_map_of_europe_before_world_war_1.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://wesonujojamoga.epizy.com/meiosis_test_questions_and_answers.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_off0000f754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF754 5152 bytes
SHA-256: 368d8d838b0a0a807fd4ada8e12ae44c38759ab0c0796cb5e36c9ded1e1b7a93
font_01_sfnt_off00010902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10902 11304 bytes
SHA-256: 7d5df66853cc4ac0f1165837942b96e6114989c8b1f2927ac8dbc8a1d75289b9
font_02_sfnt_off00012e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E51 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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