Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a05f8d006ed5d0…

MALICIOUS

PDF

96.1 KB Created: 2020-12-27 08:34:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7fcb28a0c0d74282a23cad361b801807 SHA-1: 8786e26a99c62233ffc85e9c26d6ea7fa8ac2fa2 SHA-256: a8a05f8d006ed5d0dc0b2e5398f2ec4a4d900baef2d5e17d55e651e7bacdf7b9
192 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, which is designed to lead users to malicious infrastructure. The document body, though heavily obfuscated, appears to reference a movie title, suggesting a lure for illegal downloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffmen.ru/aws?utm_term=the+darjeeling+limited+full+movie++mp4 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4373779/normal_5f8b83725a95a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475383/normal_5fd0827f5ee49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382413/normal_5f8c70456e67f.pdfIn PDF document text
    • https://xugubevowasisof.weebly.com/uploads/1/3/4/8/134885616/vetinujulozup.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/mjahh7j/homeschool_reading_curriculum_3rd_grade.pdfIn PDF document text
    • https://gilijopagexoda.weebly.com/uploads/1/3/4/7/134713479/jipinixitubek.pdfIn PDF document text
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/vasozed_bugenulo_jivufe_fovuvujaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381528/normal_5fadbb67f30c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482402/normal_5fc93faca555d.pdfIn PDF document text
    • https://cdn.sqhk.co/kitaparek/eRjdIgg/epic_games_launcher_download_not_working.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://s3.amazonaws.com/supefujoxopubu/management_reporter_ax_2012_user_access.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/bitbucket_api_repository.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d28df65-0172-44d9-8025-22e19ae60133/debate_judging_rubric_for_kids.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79f1e009-a964-4e4a-9d37-eb6fccd3a4ad/organic_solvents_polarity.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/massachusetts_agi_worksheet_form_1.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD5 6744 bytes
SHA-256: b29f9350a720d2da9dc50567d08c4a82684db1fcb28a47e3a5788345b392d808
font_01_sfnt_off00012cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBA 5332 bytes
SHA-256: c9e029f9d32b37207cb3e6ed067955ca2f9975e3638bdda3974c563fa4aeefb3
font_02_sfnt_off00013ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC3 10492 bytes
SHA-256: 5b899a230407bbf1045e8e3f49c0dcef5bad141f341ee4b71a9720ea5c0e1b65
font_03_sfnt_off0001628a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1628A 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3