Malicious PDF — malware analysis report

Static analysis result for SHA-256 1720fc694fc918e8…

MALICIOUS

PDF

82.7 KB Created: 2021-03-26 09:08:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: a9d2f0ac3adea0e21cb3af10d1fd8cb1 SHA-1: 576fac9707ac8908989c78d2d1c6bc4d4dd6da28 SHA-256: 1720fc694fc918e82c5c60f9356abc049d0a13627be8dca0c44c28b56065895e
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 pointing to disposable domains, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites, potentially for further exploitation.

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
  • 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://dugedepap.ru/wix?keyword=second+letter+of+continued+interest+law+school PDF link annotation
    • http://sipataj.sportsontheweb.net/543411474.pdfIn PDF document text
    • https://wotujajatedigi.weebly.com/uploads/1/3/5/2/135295120/7636119.pdfIn PDF document text
    • https://cdn.sqhk.co/verikiweneza/hd9eieO/can_t_update_software_on_macbook_pro.pdfIn PDF document text
    • https://cdn.sqhk.co/fowifabibu/hbhgE02/33145248622.pdfIn PDF document text
    • http://bixaxivajujojar.mypressonline.com/57914920286.pdfIn PDF document text
    • https://cdn.sqhk.co/vagofedewat/jb9haZN/make_your_own_musical_instrument_at_home.pdfIn PDF document text
    • https://cdn.sqhk.co/mipemoku/gg7icid/brochure_template_indesign_free.pdfIn PDF document text
    • https://cdn.sqhk.co/zarepowake/h2avjfI/become_president_by_acclamation.pdfIn PDF document text
    • https://moxeduve.weebly.com/uploads/1/3/0/8/130814104/804450bc59d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/united_laboratories_international_holdings_ltd_annual_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d2392fc-07e0-4c31-a41b-68c0ce1a292c/tipufirapabojilug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10ebc1ff-de52-4d49-9574-cb29e716b863/89685143900.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/organisational_behaviour_case_studies_with_answers.pdfIn PDF document text
    • http://rorazizaxaf.atwebpages.com/astronomy_free_books.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/bsc_nursing_application_form_in_rajasthan.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/microsoft_word_emergency_contact_template.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE307 5304 bytes
SHA-256: 37352dd7d3f1a82ba695daad40da503a1e4bbb26c9f69be871de7fe331ce27c6
font_01_sfnt_off0000f514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF514 3276 bytes
SHA-256: b728b3469d54b45d0daab0cd0671a35596a0f4dfbe87a72ae6ad6cbdae3f205b
font_02_sfnt_off00010271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10271 10628 bytes
SHA-256: f67a5f42edc5a28b44d1c5b492c4261a1ea0485f243e47898b507983c1ab939d
font_03_sfnt_off00012682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12682 16584 bytes
SHA-256: 3d8e3a2321d41345ade987aac40afecd67ae525b1e4e1013586012a60edc68a4