Malicious PDF — malware analysis report

Static analysis result for SHA-256 b53372e3da128342…

MALICIOUS

PDF

79.4 KB Created: 2021-03-23 08:03:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a5b00532912d8b8710187d54fcfa79d7 SHA-1: 6b17f5ce67bcb9e3b9d0c64a552cfda9231cf652 SHA-256: b53372e3da128342ad32136576d99eb8a5ae2947c9247b9a37dae96eeebe3698
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'books of the bible list printable pdf'. The presence of external URIs and the link farm heuristic indicate an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution. No scripts were extracted, but the overall structure and heuristics strongly suggest a malicious intent.

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
  • 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://kuzutuzo.ru/award?keyword=books+of+the+bible+list+printable+pdf PDF link annotation
    • https://cdn.sqhk.co/futevanu/jabj4fg/pets_vocabulary_word_search_puzzles_printable.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490746/normal_604c978b0e0a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377662/normal_5feb49afd136e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457847/normal_5fce5bdb6163c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461761/normal_603c2d9c269f0.pdfIn PDF document text
    • https://cdn.sqhk.co/fegadosijete/xMYjaCl/gs_race_skis_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/vefomatakin/gasfJjb/midevu.pdfIn PDF document text
    • https://gewipilozu.weebly.com/uploads/1/3/0/7/130775211/8984965.pdfIn PDF document text
    • https://cdn.sqhk.co/fawabanof/JhuieAp/analogy_test_questions_and_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491723/normal_5fe1a87830950.pdfIn PDF document text
    • https://gojenegitoz.weebly.com/uploads/1/3/4/3/134387591/9078523.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://460eb545-5389-4aa9-9e78-d1074a8bca0c.filesusr.com/ugd/21a131_94aeb30cac4c47b684a50d5bcb8bac24.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/tomografia_de_craneo_simple_y_contrastada.pdfIn PDF document text
    • https://09ec9d85-9312-4337-94d0-b84080e05f2e.filesusr.com/ugd/ac0094_b779bae6c0934b9284309d3356962794.pdf?index=trueIn PDF document text
    • https://78fa80b2-8629-447b-ad63-53e91e8d4948.filesusr.com/ugd/8f02de_6345e29b3f364257ba5d80ed937110fb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/95730285071.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/fopapupidoliwefijazo.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/shock_anafilactico_por_picadura_de_abeja.pdfIn PDF document text
    • https://1c92f6d8-19eb-429c-9239-1cf6be91372f.filesusr.com/ugd/cc1a03_2bbdeb10e2cb4f798ecb41adfb294389.pdf?index=trueIn 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_off0000f962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF962 5384 bytes
SHA-256: 4103d5dcf82d585fd53860e4b95320d8fb3a5b556ef6e935adf0e9984d4adbda
font_01_sfnt_off00010ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA6 10800 bytes
SHA-256: 05a7127f47248e0543f74210740fa44a727c6a2163259dfd0db1c392b2f051d8

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