Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c94460fd0b94b17…

MALICIOUS

PDF

77.7 KB Created: 2021-03-06 11:18:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4b40620bc19a2ebd3d823670b06c3298 SHA-1: a3fca0dc3f0b90083750c4fed093f45b2fa624cf SHA-256: 1c94460fd0b94b17fe8f89ccb21a650155273da17ed8e87f319a8210e294b91b
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable domains and appear to be part of a link farm. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious or spam content, likely as part of a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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://nipisod.ru/wix?keyword=molecules+worksheet+%25232 PDF link annotation
    • http://iglivesupportteam.com/69936541164c8klg.pdfIn PDF document text
    • https://zewurutivuzaned.weebly.com/uploads/1/3/4/8/134888434/zufanugezizula-foduw-lurumojorezot.pdfIn PDF document text
    • http://steelsho1.club/how_to_find_the_orbital_configurationnt29d.pdfIn PDF document text
    • http://proba7.xyz/pomafitupiboxojaduse822zc.pdfIn PDF document text
    • https://rezemofojo.weebly.com/uploads/1/3/5/3/135321986/vuluvi.pdfIn PDF document text
    • https://zuwasaroniw.weebly.com/uploads/1/3/1/3/131380739/2935845.pdfIn PDF document text
    • http://koreanluxe.com/zulagamibekozelpj7ld.pdfIn PDF document text
    • http://chambreapp.xyz/83675533514tqifr.pdfIn PDF document text
    • https://kitejunozog.weebly.com/uploads/1/3/4/3/134319277/9242569.pdfIn PDF document text
    • https://niromegezos.weebly.com/uploads/1/3/2/6/132681660/453081.pdfIn PDF document text
    • https://kawavaturitavo.weebly.com/uploads/1/3/5/3/135321378/2441049.pdfIn PDF document text
    • https://xoxebugifujame.weebly.com/uploads/1/3/4/4/134478015/jumofexuso-nofol-dekaworojim-suzoputoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e21bbf4-cc4a-41dc-b7e2-5b11a734f725/adobe_photoshop_cs6_tutorial_for_beginners_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b540185-94ca-45f3-9220-d0f1cce3cae6/what_is_adaptive_project_management_life_cycle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f8439a6-106b-447d-8b05-a68fb1324707/72370132535.pdfIn PDF document text
    • https://123949be-7110-4ba3-a240-a7df06fb38ce.filesusr.com/ugd/80fd5d_f7eae569e24644d5bf2e45b5ff19490a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6c7ec84-ea6e-45e9-bc59-3372956069b9/what_are_the_three_principles_of_logic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f472e1b-337c-4cb9-88fb-894061d443e6/wewowu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/697cd3d8-1399-4606-9616-4ae98d1b23ba/beatles_sheet_music_piano_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1545fa1-5b25-4ddf-935a-496768d2984d/jasomodatup.pdfIn PDF document text
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_5daf01f6e3b04e9b89068ce039ecfb81.pdf?index=trueIn PDF document text
    • https://b3dfd9c9-1030-471f-a26d-814ea73dbccc.filesusr.com/ugd/d97afa_f08080654c5e4477b38262e06daa5aac.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF507 4836 bytes
SHA-256: f79b81b5f6ccc0d7735f6b6599e09e3fb7ee5e4faa8f250913c056e6108332d3
font_01_sfnt_off00010593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10593 10488 bytes
SHA-256: 47d3b8b7f4f2c8b9a70330903d2709efa5ecad98100265e5e97081140e353dd4