Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddfcb373a002e49f…

MALICIOUS

PDF

73.7 KB Created: 2021-05-10 20:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 517a3c777d2d7bbabf54584cc59b8955 SHA-1: 9c3e1638a243581f4e0c3963a8b33ccd3041d0f8 SHA-256: ddfcb373a002e49f6b09abc5586046417930964cf072fe5416da5b1da94da768
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a high number of embedded URLs, many of which point to disposable domains and are associated with link farming heuristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

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
  • 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://baarspo.ru/strik?utm_term=delta+single+handle+shower+faucet+repair+parts PDF link annotation
    • http://fixmarker.fun/sam_cengage_project_answers_2018jtaly.pdfIn PDF document text
    • http://chisto-chisto52.ru/simple_present_tense_basic_exercisesrluch.pdfIn PDF document text
    • http://copyrights-notices-helps.com/juvutt9vrw.pdfIn PDF document text
    • http://avbox.org/heart_broken_songeiy5u.pdfIn PDF document text
    • http://instapriz.online/putusa3yz59.pdfIn PDF document text
    • http://file-id.ru/comparative_and_superlative_exercise4no46.pdfIn PDF document text
    • http://ca-manalapan.space/82790319075ion4x.pdfIn PDF document text
    • http://evilcheats.fun/23919856373ztci7.pdfIn PDF document text
    • http://alluniversity.fun/moto_g6_case_with_screen_protector210qa.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/palevijuj/mapewajetakesoxolimapat.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/bmc_journal_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/334eb4cf-fddd-4e8b-b971-f1c93779fd1a/51725802149.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dcd5427-a4f2-4010-8321-b249fdc310ea/60697864738.pdfIn PDF document text
    • https://9f2a6cc1-6e15-4467-beaa-57274ca996ed.filesusr.com/ugd/78f4c3_fc80e0a7b7184bd98ec4424a8d43addc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zetituri/57715274230.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/zadisesigexet.pdfIn PDF document text
    • https://df9240ce-57b4-430e-a582-521170ca5232.filesusr.com/ugd/10b03a_c9c96cd167cf49d496a5a27001d43732.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4e01140-e840-48ec-8ef3-6bf7395c8ccf/11153814010.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc0f1e4d-daee-4b6b-a9d4-41dcdc457039/very_hard_harry_potter_movie_quiz.pdfIn PDF document text
    • https://d9226533-59f4-4737-ae77-cfa9cdee5378.filesusr.com/ugd/d7c203_6fe6ee7a49294ae8979f8b46b6d9beb0.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_off0000df4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4D 5508 bytes
SHA-256: 251964295c7a99a897b614079d31b5d5d29ed455147bdd2af3e629f98ee57795
font_01_sfnt_off0000f21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21F 10888 bytes
SHA-256: 99cd8ca83ae970bb4c1466826c94895cf317bd6d36af11f19a12f3b275bbd9be

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