Malicious PDF — malware analysis report

Static analysis result for SHA-256 d756476ec14cd5e1…

MALICIOUS

PDF

76.8 KB Created: 2021-03-07 23:46:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b39efd90d55281c500d0ee2aad66c7c6 SHA-1: d699235244d9a851399d9775c62e65a9985e7640 SHA-256: d756476ec14cd5e1a83ac5117ab6ee3b7e45326e81a8748e160867ec71e918e8
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, such as 'https://resalured.ru/aws?utm_term=how+to+install+canon+mg3250+without+cd', are likely used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://resalured.ru/aws?utm_term=how+to+install+canon+mg3250+without+cd PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4407576/normal_5fca76c389c48.pdfIn PDF document text
    • https://cdn.sqhk.co/gukugifixija/ciehbgi/this_week_s_top_100_country_songs.pdfIn PDF document text
    • https://cdn.sqhk.co/sabepakofo/gexbdRs/ants_with_wings_do_they_bite.pdfIn PDF document text
    • http://xufamorazogubov.sportsontheweb.net/fowutaraxesuwegumepunod.pdfIn PDF document text
    • http://farozemirig.scienceontheweb.net/pet_sematary_book_ending_vs_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/sajatanugeg/xggHe5S/wovilojeguw.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/KfQmgf6/mindshift_backlight_26l_vs_lowepro.pdfIn PDF document text
    • https://cdn.sqhk.co/vasozaponem/MvhjGOg/5443181031.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366359/normal_5ffa03adeae24.pdfIn PDF document text
    • https://cdn.sqhk.co/piredonina/jhjeLgj/who_is_old_man_meme.pdfIn PDF document text
    • http://tokesuditetu.getenjoyment.net/free_argumentative_essay_examples_for_high_school.pdfIn PDF document text
    • https://cdn.sqhk.co/miwiwefe/CUjfbEq/spectacular_smith_net_worth.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/15d22d86-047e-41f9-b333-25e6abb07639/gobuwonekufigozu.pdfIn PDF document text
    • http://perexuwofogefo.onlinewebshop.net/17406913122.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd2ea8f7-3807-45b5-80db-fbe0aaf4ce2d/another_word_for_answering_back.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fa97fd8-b7e1-417c-aade-8bf005972c9a/what_is_critical_condition_from_aspiration.pdfIn PDF document text
    • https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_5fb755390023429391e647a762d4f39a.pdf?index=trueIn PDF document text
    • https://a765b249-d442-4b07-8ea9-8318d996b894.filesusr.com/ugd/902d29_f1bdd91fc43e48978f736888f8b4de69.pdf?index=trueIn PDF document text
    • https://ce83042b-5faf-46b5-bcbb-9b4d05ec7d33.filesusr.com/ugd/a31856_77b0d892bbd84e2f92dcd0ec67609dc7.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE061 5636 bytes
SHA-256: f2ee1ac620efb142f43ff22e049f781867676d946961dfd1d1a8d09cfbf7384e
font_01_sfnt_off0000f368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF368 10580 bytes
SHA-256: 967d7a1a4a26520f200dc19bb0237018d8fa82674acac346ae812a16dd913e3d
font_02_sfnt_off000117b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B3 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3