Malicious PDF — malware analysis report

Static analysis result for SHA-256 55dae67fc026d629…

MALICIOUS

PDF

83.0 KB Created: 2021-02-25 18:18:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c37a9bf3e212c2a1e41212d2f1b892a5 SHA-1: b04de3de0e70fb486632ce8421084e2847941098 SHA-256: 55dae67fc026d629bad9855819a47353677c76151d2e9b77f8acd12401231a7d
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure, likely intended to direct users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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/aws?utm_term=what+book+are+aasimar+in+5e In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382974/normal_60175e02aea4a.pdfIn PDF document text
    • http://ludivabuka.iblogger.org/sakumowukakekevolifope.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427529/normal_5feb72feeb9f0.pdfIn PDF document text
    • https://balawuwugo.weebly.com/uploads/1/3/4/6/134622143/5502305.pdfIn PDF document text
    • https://lataladegizozav.weebly.com/uploads/1/3/4/6/134685495/1327f37e4d.pdfIn PDF document text
    • https://cdn.sqhk.co/genopeno/2jbiaia/valley_health_link_careers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413983/normal_600b8dc456667.pdfIn PDF document text
    • https://tafiweva.weebly.com/uploads/1/3/5/9/135993394/0225c559.pdfIn PDF document text
    • https://foboxujegi.weebly.com/uploads/1/3/4/6/134694162/921921.pdfIn PDF document text
    • http://kitafoged.medianewsonline.com/tobodut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392659/normal_5fd64c0de1ce9.pdfIn PDF document text
    • https://cdn.sqhk.co/kerutadit/chjKhiR/larry_h_miller_theater_centerville_utah.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/jovekus/adding_and_subtracting_fractions_with_the_same_denominator_ks2_powerpoint.pdfIn PDF document text
    • http://notewewagegev.rf.gd/gattu_battu_cartoon_title_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/33922937481.pdfIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/2615068177.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_off0000fb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB67 5024 bytes
SHA-256: f1b4aa276957e2665d69d369ef6d655338a10ebeeac12c7a3dc4985075657439
font_01_sfnt_off00010c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C59 10716 bytes
SHA-256: ba75546ca862114b4d15a2818b3291efa786d9dbb1c41cfc0b4061d1f9718b81
font_02_sfnt_off00013107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13107 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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