Malicious PDF — malware analysis report

Static analysis result for SHA-256 a081730ca0e513e8…

MALICIOUS

PDF

89.9 KB Created: 2021-02-10 22:25:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 47b9fbe8cf77a5735d313416ba2d8877 SHA-1: 235a413f133d3596230fdc9c7bdd10b97e0be2d9 SHA-256: a081730ca0e513e8f9c1738eaee20742093062235b2142f77eab4bf8289dfc96
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan distribution attempt. The document body, though heavily obfuscated, contains text related to 'Unit 7 vocab answers level e', suggesting a lure to trick users into clicking embedded links. The heuristics indicate the PDF acts as a link farm on disposable hosting, directing users to potentially malicious URLs like https://maypoin.ru/123?utm_term=unit+7+vocab+answers+level+e.

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://maypoin.ru/123?utm_term=unit+7+vocab+answers+level+e PDF link annotation
    • https://xobijuveja.weebly.com/uploads/1/3/1/6/131606615/tuxubetitif-fodigow-sijonizatiboni.pdfIn PDF document text
    • http://damvglaz2.xyz/susobutesoxawqjoj.pdfIn PDF document text
    • http://manybigs.space/super_retro_16_1._9_6_apk_paidwjq7a.pdfIn PDF document text
    • https://cdn.sqhk.co/vurifozi/wgenibC/pydroid_3_ide_for_python_3_download.pdfIn PDF document text
    • http://sfr-webmail.com/budismo_vajrayanavq7i1.pdfIn PDF document text
    • https://zogininofifus.weebly.com/uploads/1/3/2/6/132695288/nasekukadavumokev.pdfIn PDF document text
    • http://tehnotop.store/metal_slug_3d_androidtet1q.pdfIn PDF document text
    • http://ultra0.space/classified_website_template75t6n.pdfIn PDF document text
    • http://qqkaxes.xyz/lalitozovubefolox0vak.pdfIn PDF document text
    • http://moekolechko.icu/2135562198757nxh.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojelawov/ijhbnEO/dujamexewutipimaja.pdfIn PDF document text
    • https://wuremude.weebly.com/uploads/1/3/2/8/132815206/gituwudusur.pdfIn PDF document text
    • http://verifiedbadges-form.com/wafiwotedufanexetopejebiltyqhy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kiwuvapinemugi.rf.gd/boss_katana_tone_studio_manual.pdfIn PDF document text
    • http://duvexarido.epizy.com/divinity_original_sin_complete_crafting_guide.pdfIn PDF document text
    • http://xenivut.epizy.com/70488185673.pdfIn PDF document text
    • http://talifox.rf.gd/laplace_m_cooking_guide.pdfIn PDF document text
    • http://suvumudupese.epizy.com/41265151705.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_off0001241d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241D 5156 bytes
SHA-256: 16340f805f02db218f5a3e8a4a15d6b8ad4e4801139f48815eb87d48019331c5
font_01_sfnt_off000135d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D2 10768 bytes
SHA-256: 5e91ae1091dd4aece86e0485f092bab8372362ea431a7b8812861b6dce70813a

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