Malicious PDF — malware analysis report

Static analysis result for SHA-256 e50e2b648794c588…

MALICIOUS

PDF

72.2 KB Created: 2021-03-29 15:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e8acf816bd73e467a0a304c9b133ba04 SHA-1: 2823c46495803a9a46d3f469727b80396eca0131 SHA-256: e50e2b648794c5888ac7d54f037b37c2774ca313b49d38056a5b642b79500a6d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting or redirectors, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with techniques used to lure users to malicious websites.

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://druttle.ru/strik?utm_term=ge+digital+telephone+answering+machine PDF link annotation
    • http://hookup158.fun/vugeperubupifeloyqhcb.pdfIn PDF document text
    • https://cdn.sqhk.co/noxisoture/dqAksyE/jubamufuv.pdfIn PDF document text
    • http://ita-women.space/91670345252pljjv.pdfIn PDF document text
    • http://vugekowuzujed.scienceontheweb.net/56353423554.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzexesetaba/jyVgejh/woziv.pdfIn PDF document text
    • http://pixujuxe.mypressonline.com/56406302987.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493597/normal_60062dca2e679.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388815/normal_60300bfa2cc58.pdfIn PDF document text
    • http://rabota-plus.club/jolonojobudesoxazufokir3kc.pdfIn PDF document text
    • https://cdn.sqhk.co/munenetifu/j7Kjihb/jaxatotuvojukedib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447912/normal_60462dfde1361.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367668/normal_6049f51cf1705.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448984/normal_5ff668edd4b4d.pdfIn PDF document text
    • http://instapriz365.site/marathon_csar_watch_review5h8s0.pdfIn PDF document text
    • https://cdn.sqhk.co/lidumezuvir/hagihi5/cytosine_deamination_mutation.pdfIn PDF document text
    • https://cdn.sqhk.co/xufuwejaxe/gohbAQZ/jusumukozidezomafegosopiz.pdfIn PDF document text
    • https://cdn.sqhk.co/zojoguxuban/crWAdr0/50059306867.pdfIn PDF document text
    • http://keysecret.ru/58318313878398tn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://setewexevevel.epizy.com/prueba_carbono_14.pdfIn PDF document text
    • http://vijijowop.epizy.com/allison_transmission_fault_code_p0897.pdfIn PDF document text
    • http://gegenig.epizy.com/6308755351.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_off0000da57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA57 5608 bytes
SHA-256: 5b5ccb8e72b6ce4902bb92ffd14a72c32a4d2a1e29cbafae196ed6010ccb26d3
font_01_sfnt_off0000ed56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED56 11272 bytes
SHA-256: 2aefa56203553b60c2300c90d9189be06ef2936e4869ec373e59255679277512

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