Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0c4d1906cae4579…

MALICIOUS

PDF

73.8 KB Created: 2021-06-07 07:18:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2e63562e58eae779d1beb72630152649 SHA-1: a89120c0dc0f4e94868d0a58069917e34805b016 SHA-256: a0c4d1906cae457954bdd22b373d2f02d092eace5a01617fe8b4b70a76110841
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary external URI pointing to 'https://synerhu.ru/pbw?utm_term=how+to+put+a+pull+up+bar+in+your+garage'. This URL, combined with the document body's deceptive title, suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the redirection of users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/pbw?utm_term=how+to+put+a+pull+up+bar+in+your+garage PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4423195/normal_6003e4a919d57.pdfIn PDF document text
    • https://lepeposozul.weebly.com/uploads/1/3/5/3/135317560/jinilividajarori.pdfIn PDF document text
    • https://fifilukativoj.weebly.com/uploads/1/3/4/5/134509223/xepoza_bafobuputa_gijux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454982/normal_5fea064fa5734.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479925/normal_5fec04edcde56.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459058/normal_5fca43caf1733.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4479921/normal_60b52e220da59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385421/normal_60693656c7060.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423430/normal_6034201d4ba84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402717/normal_6040b2f38e6bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470232/normal_5fe20f551c6ef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nosegawibaso.pbworks.com/f/jemoxutakexetegijuxux.pdfIn PDF document text
    • http://gaguseka.pbworks.com/f/christmas_free_worksheets_reading_comprehension.pdfIn PDF document text
    • http://rekadezabo.pbworks.com/w/file/fetch/144727602/casualty_season_34_episode_41_cast_list.pdfIn PDF document text
    • http://lagawiwefe.pbworks.com/f/garrett_gti_2500_manuale_duso_in_italiano.pdfIn PDF document text
    • http://fulusivijomu.pbworks.com/w/file/fetch/144773055/us_guided_needle_biopsy_breast_cpt_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5239be4-8123-44aa-b450-46d0578bffba/going_somewhere_andrew_marino.pdfIn PDF document text
    • http://zemenifinabe.pbworks.com/f/do_covalent_bonds_form_molecules.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ef333ca-cc1e-4c77-8e9b-f463669354e0/zaxuwalinoribigu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c46d4475-51a4-4f30-b102-a595728a9c3b/how_to_write_sinx_in_latex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd6d61b9-4879-4304-8b43-8552cdec2de7/rising_strong_spokane_phone_number.pdfIn PDF document text
    • http://kekivozafiko.pbworks.com/w/file/fetch/144657843/62263445379.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/024b964b-9daa-4c26-aab1-9a613059e2f5/71653959798.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A9 5104 bytes
SHA-256: 5d9e63b9b76650dc016fd36783fc8a9fdd22b0447c7ff2d92d6303314692c451
font_01_sfnt_off0000f42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42C 10536 bytes
SHA-256: 45c42aff44f5518b29af42814e667ea12806975dc5d6926227a2e636871fea45