Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdf1f607a09086c3…

MALICIOUS

PDF

88.7 KB Created: 2021-03-15 00:35:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: db6b776517e59b35db2de223ee4d0397 SHA-1: bf36c4d0e3299faafee4b00af38dbdbd82281ea2 SHA-256: fdf1f607a09086c394908e2550e082e6eaf930fc5bc7f984a9dd1c20b3705bac
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 hosted on disposable domains, indicating a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious sites.

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://fokemale.ru/strik?utm_term=set+for+life+scott+trench+summary PDF link annotation
    • http://lg-supportteam.com/pencil_animation_software_free8xbna.pdfIn PDF document text
    • http://generatorsale.ru/house_rent_receipt_format_for_income_tax_exemption_in_hindi2jt57.pdfIn PDF document text
    • http://selectgetc.top/nursing_code_of_conductpnbpc.pdfIn PDF document text
    • http://euroshopme.site/579296210905594n.pdfIn PDF document text
    • http://antinomi.design/jitumokok5424.pdfIn PDF document text
    • http://bumaga.bz/mojazubebixavowetumaji3jfs8.pdfIn PDF document text
    • http://tikovg.xyz/hp_probook_4545se3spc.pdfIn PDF document text
    • http://wowezixuxaxu.22web.org/jawiw.pdfIn PDF document text
    • http://bawesijum.22web.org/book_report_sample_7th_grade.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://35548484-ce42-4b18-9d9d-834326683263.filesusr.com/ugd/a221b6_4bae0bff680c443fb1cae11ff42b7b2e.pdf?index=trueIn PDF document text
    • https://4df13e88-3832-489f-a2fb-efc164621ec7.filesusr.com/ugd/a298ce_2f75b27259264c4c9e1689707025ca09.pdf?index=trueIn PDF document text
    • http://dunixojojulif.epizy.com/the_nature_of_scientific_knowledge_springer.pdfIn PDF document text
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_4b8ee26c9fe047348559030fe514f510.pdf?index=trueIn PDF document text
    • https://50fe66f1-00be-429c-ab6c-57a9f80d6ab9.filesusr.com/ugd/39cb9d_1e7e32bd84ed4aa39fb0baa820089b8d.pdf?index=trueIn PDF document text
    • https://3b0fe5ff-7f86-489c-8138-fc984e51136c.filesusr.com/ugd/bfd78a_71124245860c43608c711e8b8cbab48d.pdf?index=trueIn PDF document text
    • https://39c10a3a-92c6-412a-a1bb-b8a1fc48fbc4.filesusr.com/ugd/259099_52fc5ea6598c4e008ce596b39cc895c1.pdf?index=trueIn PDF document text
    • https://cb47f074-0476-4434-b381-5672a365cab8.filesusr.com/ugd/c46c8a_be1e7b8ba419412e9688df576854f335.pdf?index=trueIn PDF document text
    • http://tutalisog.rf.gd/school_annual_day_dance_performance.pdfIn PDF document text
    • https://013c3ecd-17dd-4738-ad87-554153c764a5.filesusr.com/ugd/36f25b_91e9dea3f335429bb8dac70091de14ff.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C0 5324 bytes
SHA-256: 05b4535d40d1a73bf249b526c2fcba1adaf6acf0d8eddcad9802fa499646b942
font_01_sfnt_off000115b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B8 11768 bytes
SHA-256: 48d7cfe60de9d5a8823e2decd9a8e86fe4754782cc2162b2fdfe93235ff00a9a
font_02_sfnt_off00013df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF5 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e