Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9e7df78c68d0af1…

MALICIOUS

PDF

74.9 KB Created: 2021-04-08 06:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 9c90824048979442a84c3c6c49eaea46 SHA-1: 71738946970a6f95dee54dd892e9e839dc2a26b8 SHA-256: d9e7df78c68d0af120b17043593613776e4910d2ce37eb7ce691a7b18b105975
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure malicious links within a large number of seemingly legitimate ones. The primary malicious URL identified is https://seumenha.ru/123?utm_term=alternative+assessment+in+education+pdf, which likely serves as a lure for phishing or malware distribution.

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://seumenha.ru/123?utm_term=alternative+assessment+in+education+pdf PDF link annotation
    • https://zevofukuje.weebly.com/uploads/1/3/4/5/134585027/a49caf429df339.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482872/normal_604a8af38ad29.pdfIn PDF document text
    • http://gutufozif.iblogger.org/25191369151.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385647/normal_5fd3311e08ab9.pdfIn PDF document text
    • https://lotepipi.weebly.com/uploads/1/3/1/4/131454034/6181421.pdfIn PDF document text
    • https://cdn.sqhk.co/bilanogakiw/xhgDhcr/inferno_lobby_login.pdfIn PDF document text
    • https://ruwatija.weebly.com/uploads/1/3/4/8/134846771/3b3153cab706.pdfIn PDF document text
    • https://cdn.sqhk.co/tarekekog/dvjh6OZ/last_pirate_island_survival_apk.pdfIn PDF document text
    • https://duxoberadu.weebly.com/uploads/1/3/4/7/134718286/ac6a9a22f41feb7.pdfIn PDF document text
    • http://savagolisax.22web.org/98996785736.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493888/normal_6034ea7c5a5dc.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/wibedubosateg/sezerowutefaturojej.pdfIn PDF document text
    • http://lodufuvu.epizy.com/bejof.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/bewoliratanozoxobow.pdfIn PDF document text
    • http://luxogigir.rf.gd/23909230408.pdfIn PDF document text
    • http://kipurifer.epizy.com/48547036583.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/googlemaps_android_app_tutorial.pdfIn PDF document text
    • http://dadagax.epizy.com/cisco_8742hdc_user_guide.pdfIn PDF document text
    • http://pugapugene.rf.gd/44483925298.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_off0000e800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE800 5352 bytes
SHA-256: 687b0867da38e25ee204f4779dc7e50ce90cb201d94d2d09e912838f1dbed080
font_01_sfnt_off0000fa25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA25 10644 bytes
SHA-256: 0d4f0df5b13b00ad5ac911de16b6f0d25d6516f4ed20d716edcdc9bc8b1b6b91

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