Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba5568f9f9811bac…

MALICIOUS

PDF

80.1 KB Created: 2021-04-25 00:28:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f319edd4de01fea86934dd3ca89cbd81 SHA-1: b7c53286a4e3a24294765e9a64712c674bbda505 SHA-256: ba5568f9f9811bace0118b607e1f4929016c190a15bd1127f84071c4724883b4
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://crophysi.ru/strik?utm_term=how+to+make+hydrogenated+oil+at+home In PDF document text
    • http://cmbclientes.com/allen_bradley_inverter_powerflex_4_manualcrku0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369514/normal_6057ddc986215.pdfIn PDF document text
    • https://bexaxaxaf.weebly.com/uploads/1/3/2/6/132682125/6430db6ee2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465685/normal_5feea76942d6f.pdfIn PDF document text
    • http://totalcreditreport.info/370145051198kze2.pdfIn PDF document text
    • http://mxsale.info/neuroscience_exploring_the_brain_4th_edition_isbnb4gk5.pdfIn PDF document text
    • https://ginadilu.weebly.com/uploads/1/3/4/7/134768391/8802267.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485711/normal_604a75c9bdd4d.pdfIn PDF document text
    • http://idealsit.space/522006243442zcm7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489843/normal_600d583c124fe.pdfIn PDF document text
    • https://nitiruminaxodax.weebly.com/uploads/1/3/0/7/130738633/9f0538a369f22.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428083/normal_5fd09213d73d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484835/normal_606116d5c4a6a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ec5c17a1-061e-4a2c-a9e6-b3561ba71229.filesusr.com/ugd/299074_f21a0e2d69c040568a3b6ae5e5540aa6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bf5d784-bf8c-4a10-92cc-157ffa2f8f6a/como_ser_un_lder_en_el_trabajo.pdfIn PDF document text
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_8108da943b0d4811b529580c4b264457.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/16f941c3-0c6b-4123-80de-c60423bad50b/how_much_room_do_you_need_for_a_shuffleboard_table.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab4296c7-3085-4257-9148-192f4812ec20/52584404650.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6351916b-4c49-46ba-abd0-c2cec23fd259/tonenozerijutojeduv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9db04777-9061-4520-85bf-bee7d2ca1c2f/sector_of_a_circle_worksheet_with_answers.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_off0000fb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB45 5280 bytes
SHA-256: ceaa778a79f2d776c1d34b2b0af26f3bafa6aea475116d9286c4d9b23638fd8c
font_01_sfnt_off00010d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D20 11152 bytes
SHA-256: 9762592d656cb2eab4fb90bf1be5ddf028917c231aeb8df1facc1867f42aafd3