Malicious PDF — malware analysis report

Static analysis result for SHA-256 53b379286e19ab4e…

MALICIOUS

PDF

78.5 KB Created: 2021-04-06 01:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 540eade696c080cf38716db021c16e67 SHA-1: 4f029ab567459ad1820b0758563095383c078544 SHA-256: 53b379286e19ab4e49f39c0674009298bdf0fab10306d87571a20143c0d7cbf5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm designed to redirect users to external sites. The document contains numerous embedded URLs, many hosted on disposable domains, suggesting an attempt to obscure the ultimate destination or distribute malicious content. The presence of external links and the overall structure indicate a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://pelibifir.ru/123?utm_term=best+king+size+sheets+with+deep+pockets PDF link annotation
    • https://gejejemimegi.weebly.com/uploads/1/3/4/8/134899280/fitorituzavel-rikowa-baradudarudaxu-sapozepubefa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505159/normal_5fc730b512051.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470209/normal_6043613fe7b58.pdfIn PDF document text
    • https://siximegam.weebly.com/uploads/1/3/1/4/131453251/nikuzanavoxar-bigerejoz.pdfIn PDF document text
    • https://cdn.sqhk.co/kedilexele/jguYyih/xepikufurewu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403533/normal_60499ccb0adc2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456687/normal_5fc8ac3724608.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406777/normal_604cbd412140c.pdfIn PDF document text
    • http://golepikoxeware.22web.org/fowomelaje.pdfIn PDF document text
    • https://cdn.sqhk.co/pefevepufi/y59hfic/art_of_war_book_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453102/normal_6036dc64bdc3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374021/normal_60316e4bb54ab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/2d_platform_game_maker_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/tamazit.pdfIn PDF document text
    • http://fepujevuzal.rf.gd/cell_cycle_and_cancer_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/33566827190.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_off0000f498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF498 5252 bytes
SHA-256: 9a2c0b8db229734aa18f348596b3f9209452c153e1d3d155dc21f87939faa918
font_01_sfnt_off0001069f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069F 10752 bytes
SHA-256: 6cddde6ebe6619df6ce8a689396d25bd43d230574e05623afd1262394ae1b30c

Open this report in the interactive analyzer, or submit your own file for analysis.