Malicious PDF — malware analysis report

Static analysis result for SHA-256 411af11bab725d76…

MALICIOUS

PDF

79.9 KB Created: 2021-04-04 00:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 2cc8f6c0f38c5b992aadf9ecaf58114a SHA-1: d9a9b49d419028d3edc220a625d5c6884c4a3f72 SHA-256: 411af11bab725d763d3de8e220a36c786c183c3084395343c2ae4857f25a728f
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 of which point to disposable domains and are indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs are sufficient to infer a malicious attack pattern.

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/strik?utm_term=how+long+should+a+whirlpool+fridge+last PDF link annotation
    • http://pelopof.iblogger.org/bill_of_lading_types.pdfIn PDF document text
    • http://zijaditenup.getenjoyment.net/daily_use_vocabulary_words_with_meaning_in_urdu.pdfIn PDF document text
    • http://tuvurebomiworo.scienceontheweb.net/amendments_in_constitution_of_pakistan_1973_in_urdu.pdfIn PDF document text
    • https://cdn.sqhk.co/zisenusaf/Sqrhhhg/programmable_character_generator.pdfIn PDF document text
    • https://cdn.sqhk.co/rawuredilu/0ibidde/happy_birthday_bunting_printable.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367268/normal_6049c0e59791f.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuvezosapa/a1gjuk6/xfinity_prepaid_phone_number.pdfIn PDF document text
    • http://leninuludobodu.mygamesonline.org/algebra_nation_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469351/normal_603d8763e9583.pdfIn PDF document text
    • http://apple-fruit.space/aha_guidelines_for_bls_2017g8gpg.pdfIn PDF document text
    • http://ceter.xyz/can_microsoft_office_be_used_on_ipad_proaj2cj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469350/normal_600f97aec22f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446636/normal_5ff2d28ec97b3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/09053a44-e062-42b1-98a9-a8c6baca97ce/begodonixasuwezup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8063cfb-a8f9-4d92-b2f1-d6360261804c/watch_australian_stock_market_live.pdfIn PDF document text
    • http://timavutiziv.epizy.com/business_authorization_form_cra.pdfIn PDF document text
    • http://vonanovab.epizy.com/spoken_english_book_in_marathi.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_off0000fe31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE31 5356 bytes
SHA-256: f08fe6b59056ad54a65199b4b217b149d34a2d8601e48b96488dbd8eea4aef7c
font_01_sfnt_off00011070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11070 9968 bytes
SHA-256: fb567b81ed911b27df68a5e56fdd4aea9b14333d160222f9e66648c0b89c8096

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