Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba6f305e725d02ca…

MALICIOUS

PDF

71.6 KB Created: 2021-03-05 17:05:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 00488ed2bc262f3d6300de1328999903 SHA-1: 6e7a963889d93233738e4755ff775e47067580ba SHA-256: ba6f305e725d02caba01f786d46e712bde08f93c1b12774c60b97a12a7ecf865
184 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure, specifically `https://dafemum.ru/award?keyword=can%2527t+help+falling+in+love+lyrics+haley+reinhart+karaoke`. The heuristic `PDF_MALICIOUS_REDIRECTOR_LINK` confirms this, and the ML classifier `ML_NYX_PDF_MALICIOUS` also flagged the sample with high confidence. The document's purpose appears to be to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://dafemum.ru/award?keyword=can%2527t+help+falling+in+love+lyrics+haley+reinhart+karaoke In PDF document text
    • https://cdn.sqhk.co/lididiregi/jQCPqu9/knex_serpent_spiral_roller_coaster.pdfIn PDF document text
    • http://dabedera.mygamesonline.org/25310446129.pdfIn PDF document text
    • https://cdn.sqhk.co/vapumojemov/jcxgnzq/17209279931.pdfIn PDF document text
    • https://cdn.sqhk.co/pawijilabu/hgqQ0jd/wuxid.pdfIn PDF document text
    • http://gimatadokij.mygamesonline.org/wings_of_fire_books_11-15_box_set.pdfIn PDF document text
    • https://cdn.sqhk.co/vijukifezu/njhcljb/lesson_plan_format_high_school.pdfIn PDF document text
    • https://cdn.sqhk.co/feletitami/YcIjcE4/rokapoduxajijopikowolar.pdfIn PDF document text
    • http://lorakuze.sportsontheweb.net/87259050638.pdfIn PDF document text
    • https://cdn.sqhk.co/fivukidado/RmMpjiU/not_supposed_synonym.pdfIn PDF document text
    • http://vosajizegek.mypressonline.com/air_o_swiss_7135_filter_replacement.pdfIn PDF document text
    • https://cdn.sqhk.co/munuluxel/frjcig7/25848021825.pdfIn PDF document text
    • http://natosabi.mygamesonline.org/woronujaziradaduberufo.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
    • http://ziwotivusatufif.rf.gd/taotao_50cc_atv_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6d79232-f2d2-428c-b8d7-a6aa82371263/kilusebuvuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7ca4dff-fdee-414b-b7c3-0271a58809e8/add_2nd_edition_ravenloft.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0410353-f136-455b-a0c6-81c742b97e79/how_to_reset_schlage_change_code.pdfIn PDF document text
    • http://rujidafedisezu.atwebpages.com/how_much_does_a_55_inch_plasma_tv_weigh.pdfIn PDF document text
    • http://fabedidatifi.onlinewebshop.net/electric_scooter_repair_san_diego.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e1293c0-6f76-494d-b7f8-9199e0054c88/what_colleges_are_known_for_biology.pdfIn PDF document text
    • http://laxolivavaru.epizy.com/gupizozil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4300882-cdf8-4c14-8b24-73ec190fc793/how_to_origami_dragon_easy.pdfIn PDF document text
    • http://xogaxuf.epizy.com/sakul.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7E 5348 bytes
SHA-256: 823be8769f418e7406d55cc32b659ad76ab22b9474070a6e125791c715b69ac0
font_01_sfnt_off0000dfbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBF 10132 bytes
SHA-256: ef79458c8ff10db4936f0a4bcaf97fb30d968fc4610fa00617a5a79087173880
font_02_sfnt_off00010274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10274 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3