Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a745487bbb63541…

MALICIOUS

PDF

75.4 KB Created: 2021-02-25 02:47:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 15e3630cef2695496c63ff8d4b199e9b SHA-1: 1bf97a99ddd68f68ed9db0f0c6cc0c67c325501b SHA-256: 1a745487bbb635416d372ac5b1b636a3169ffec6b6dc6fb1bf495eba9a67a9f4
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous external URLs, many hosted on disposable domains or link farms, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://jacksth.ru/123?utm_term=samsung+galaxy+note+4+user+manual PDF link annotation
    • https://cdn.sqhk.co/xulawajikigi/6gjjhx1/key_battles_of_the_us_civil_war.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/jegeqhh/froggers_mount_dora_specials.pdfIn PDF document text
    • https://cdn.sqhk.co/gunuzuli/FILggQh/zavupixame.pdfIn PDF document text
    • https://vakofariz.weebly.com/uploads/1/3/1/4/131438137/351f33a3.pdfIn PDF document text
    • https://fisusaweku.weebly.com/uploads/1/3/1/8/131857315/fenal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483089/normal_5ffe6c09be5f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380395/normal_602463b1c9daf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495526/normal_5fe4fcd91c38b.pdfIn PDF document text
    • https://cdn.sqhk.co/petawelesup/jThc1hb/25210846432.pdfIn PDF document text
    • https://xugubevowasisof.weebly.com/uploads/1/3/4/8/134885616/3605718.pdfIn PDF document text
    • https://sigukelerodon.weebly.com/uploads/1/3/4/4/134491686/7259099.pdfIn PDF document text
    • http://bagerisevi.scienceontheweb.net/womizik.pdfIn PDF document text
    • https://cdn.sqhk.co/fudikuzi/7hdhiJ1/stair_runner_ideas_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/metajewamiva/xlLuQjd/1371585921.pdfIn PDF document text
    • http://lulopoboxefon.scienceontheweb.net/how_to_fold_fisher_price_swing.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390995/normal_5feb2c83d93b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463266/normal_5fd68bc156b5f.pdfIn PDF document text
    • http://derilezin.sportsontheweb.net/56964066370.pdfIn PDF document text
    • http://muzibatixabu.mypressonline.com/metric_mania_worksheet_answer_key.pdfIn PDF document text
    • https://karawabinu.weebly.com/uploads/1/3/1/4/131453718/jenakag.pdfIn PDF document text
    • https://cdn.sqhk.co/tukutabu/fidRDih/visit_a_city_barcelona_2_days.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000eae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE2 5364 bytes
SHA-256: 3942a77826ee99fff994bbb543498248e36f149cfd12dfdfd0dc9932c4209cf1
font_01_sfnt_off0000fd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1C 10268 bytes
SHA-256: 041ae8c25f9d630858b09131b029dc505b59ee5adad712ec5e6fec219764796d

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