Malicious PDF — malware analysis report

Static analysis result for SHA-256 f557f4b1ea382008…

MALICIOUS

PDF

76.8 KB Created: 2021-03-10 21:53:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8973df8708610ba1c64692db484b3e48 SHA-1: 8b95b3b805e4fa4cc727dee502c220a65d3fe0bd SHA-256: f557f4b1ea382008ccee1f57084e7c978481e087c27a58fb5be315323abad811
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of 'gphr study guide' in a URL and the document body suggests a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/123?utm_term=gphr+study+guide PDF link annotation
    • http://vipimuxatomefi.medianewsonline.com/taxaroturito.pdfIn PDF document text
    • http://pitikudefojeken.getenjoyment.net/nofadudapisigi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424647/normal_6034085a35d71.pdfIn PDF document text
    • http://mizifasurogik.mywebcommunity.org/toro_power_clear_21_review.pdfIn PDF document text
    • http://pitushok.space/36578757731cx5t5.pdfIn PDF document text
    • http://kazaxukiga.getenjoyment.net/73126610028.pdfIn PDF document text
    • http://zomolejefej.mywebcommunity.org/the_living_christ_printable.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444386/normal_6018360cb3518.pdfIn PDF document text
    • http://zokiwedilar.mypressonline.com/why_is_my_carbon_monoxide_alarm_flashing_red.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412763/normal_600c67bec4886.pdfIn PDF document text
    • http://luwinilulurop.mywebcommunity.org/58337925522.pdfIn PDF document text
    • http://famozosivupiwij.sportsontheweb.net/75371419364.pdfIn PDF document text
    • http://pshcomonhere.xyz/tegarifugenovizejoxiniwal6o3e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462344/normal_6008e1d72d322.pdfIn PDF document text
    • http://juwupexutaval.mywebcommunity.org/open_sentry_safe_lost_combination.pdfIn PDF document text
    • http://muzhskoizhurnal.ru/tegigorabgfk4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450043/normal_60450e8e77f63.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xabudavadeguvo.myartsonline.com/black_friday_2020_ads.pdfIn PDF document text
    • http://redifigikutusoj.myartsonline.com/gokoxoxutitunona.pdfIn PDF document text
    • http://dipagepe.atwebpages.com/wizawoperodip.pdfIn PDF document text
    • http://roxujewov.myartsonline.com/69137383730.pdfIn PDF document text
    • http://pekiluji.atwebpages.com/gisogojapusoxu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ede4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE4 5112 bytes
SHA-256: b2d2911b69689d17898fc1c74ab0e1e8db63c54292ff0a77b51f97cd725788e4
font_01_sfnt_off0000ff4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4C 11448 bytes
SHA-256: a83586e0584ae70ea28bddaa7b7db63d637e62b6e234a612e56921180e8d39fb

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