Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5959e32de2af59e…

MALICIOUS

PDF

74.4 KB Created: 2021-02-17 06:52:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 234fd8151da9b80537d3127b751b8203 SHA-1: ca94da49ea017e43179cc15b4d1dc8bcffd99c43 SHA-256: a5959e32de2af59e3b66902aa517032a69fda5ccad0639eaa9dbcb8f92c4bcbd
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the presence of embedded URLs and the PDF structure indicate an attempt to direct the user to potentially malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/123?utm_term=types+of+heat+pumps PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4370074/normal_5fc865ce172bf.pdfIn PDF document text
    • https://mufamemibota.weebly.com/uploads/1/3/1/8/131856380/zorufopi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385614/normal_5fcc84abdbca0.pdfIn PDF document text
    • https://cdn.sqhk.co/fematixub/gzhab9b/bapirawejovikivoranigu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458144/normal_5ff639da9b744.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/hfXjagh/fall_guys_mobile_release_date_ios.pdfIn PDF document text
    • http://it50discount.pro/boardroom_limited_singapore_annual_reportdsu9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463264/normal_6021cd6775abd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495685/normal_5ffc0bd28ff81.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411923/normal_5ff4fa356a78c.pdfIn PDF document text
    • https://kojaresojew.weebly.com/uploads/1/3/4/3/134312518/9260519.pdfIn PDF document text
    • https://cdn.sqhk.co/pajerelo/bwRlidl/minecraft_exploration_craft_download_pc.pdfIn PDF document text
    • http://mnatural.space/answers_for_elementary_statistics_7th_editionnp3oc.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/sU6Dqgf/naporarorexujupom.pdfIn PDF document text
    • https://tidatulo.weebly.com/uploads/1/3/2/8/132815220/medixunozepilaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455659/normal_601614ec10834.pdfIn PDF document text
    • https://cdn.sqhk.co/xasakeza/Zgfhfhh/car_price_calculator_olx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/sigigikifozapa.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/boston_terrier_coloring_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/lagu_bohong_kamu_tukang_bohong_k3s.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/b_a_s_i_c_full_form.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DD 5064 bytes
SHA-256: fcdce7daa42c459de99238f4ea8a1d0758f73a74c8bb3fe53b0c1259f1688741
font_01_sfnt_off0000f8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FD 10556 bytes
SHA-256: f8155d9b88ee41e1954cb3be2b29eaa273a0f6be9c67594c353745fa15f4363b

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