Malicious PDF — malware analysis report

Static analysis result for SHA-256 10ef0b5e15907b5a…

MALICIOUS

PDF

100.2 KB Created: 2021-04-10 12:33:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ce7a9e5c1ebcbac371200938c29fe492 SHA-1: 844780361ad1bc5da7ca662587e1b464ea71b676 SHA-256: 10ef0b5e15907b5a9b6dda6ea44b43a7139ab58d23973224f4dec16639167d67
184 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous embedded links, many pointing to disposable domains and redirector infrastructure, suggesting an attempt to lead users to malicious websites. The document body, though heavily obfuscated, contains text related to search queries, further supporting the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=what+does+the+acronym+safe+stand+for+in+fire+safety In PDF document text
    • http://trikotoria.ru/how_to_reset_a_moultrie_camerakkc7j.pdfIn PDF document text
    • http://chambrehq.xyz/husqvarna_55_chainsaw_spark_plug_gapd02a1.pdfIn PDF document text
    • http://dsv-trening.ru/young_sherlock_holmes_books_in_orderp8d04.pdfIn PDF document text
    • http://kozijadeji.22web.org/technical_writing.pdfIn PDF document text
    • http://bivozebavi.iblogger.org/arreglos_en_java_ejemplos.pdfIn PDF document text
    • http://alphabitx.com/14961606166h2bkt.pdfIn PDF document text
    • http://jolaxamitagifa.iblogger.org/wordalot_answers_241.pdfIn PDF document text
    • http://vovpomnim.ru/english_story_book_appjhaxa.pdfIn PDF document text
    • http://losiruwu.66ghz.com/61920018094.pdfIn PDF document text
    • http://voirly.xyz/vaxinokasuredonurakvb6j.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luvubarebefu.rf.gd/28741966645.pdfIn PDF document text
    • http://tixelupaninaber.rf.gd/45502460208.pdfIn PDF document text
    • http://miganuvag.myartsonline.com/the_great_hunt_extreme_mount_drop.pdfIn PDF document text
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_b37ac3dfefad42cdb10f7cac19c9b200.pdf?index=trueIn PDF document text
    • http://junaken.onlinewebshop.net/reliability_analysis_in_research.pdfIn PDF document text
    • https://054d5c26-596f-48a3-87a7-0fc79031e5db.filesusr.com/ugd/599026_b8a3b57de6604550bd24efd025b1bd4b.pdf?index=trueIn 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_off000147ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147CA 5344 bytes
SHA-256: 6d8c8545afc568f250d6b8cf7e2093b5815c183fd64591bdd42baf47a0a6a0d9
font_01_sfnt_off000159e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159E1 11536 bytes
SHA-256: f97125f56e031c49cb8411edcbaf244e58f76307db3640f388b68ad493fe3583

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