Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0511f2fc90cf772…

MALICIOUS

PDF

73.9 KB Created: 2021-03-12 19:27:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1eb13134469ad9b221934565d0d3b3ad SHA-1: 219d4d2337a49ce71ffc2728fe0109a2da1623c6 SHA-256: e0511f2fc90cf77230d0d6f0d1289a57aaaf422466e8756067f3f92a372dc1cf
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs pointing to external PDF files hosted on various domains, some of which are identified as disposable. The primary purpose appears to be directing users to potentially harmful content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/award?keyword=conversion+units+worksheet+pdf PDF link annotation
    • https://cdn.sqhk.co/xawobovuji/e0ievij/beautiful_dreamer_lyrics_beatles.pdfIn PDF document text
    • https://cdn.sqhk.co/satukevaguka/qg8ge3T/pin_pull_game_app.pdfIn PDF document text
    • https://mojogobiwed.weebly.com/uploads/1/3/4/7/134747953/tixodusimesor_tunogosa.pdfIn PDF document text
    • https://cdn.sqhk.co/gisusisabez/cL0Bjax/game_grand_battle_royale_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/givujelised/hgjfsdI/83306473902.pdfIn PDF document text
    • https://jinokafolamod.weebly.com/uploads/1/3/4/3/134310646/604f5761a94495.pdfIn PDF document text
    • https://cdn.sqhk.co/wogefosa/igiaegi/nifafutesetukepatilasuxu.pdfIn PDF document text
    • https://peposinosodidel.weebly.com/uploads/1/3/4/3/134317522/duxaziziwep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://78151a86-a557-4e49-81aa-a2539eea45c7.filesusr.com/ugd/204f4f_357de0c7803e424dbbd17e14a4edd1f8.pdf?index=trueIn PDF document text
    • https://ce3a146a-d504-4efb-981c-4593fb85d965.filesusr.com/ugd/5b5da7_0b69855911fc400f917ed13ac1670aa5.pdf?index=trueIn PDF document text
    • https://79e5ec13-148a-49e7-9308-7b7844992bd9.filesusr.com/ugd/1d149b_e1f5e1e5611b4947aec39b445a2f8379.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d9fe8e0-acb0-4adf-8d27-e1b6409d8518/romeo_y_julieta_cigars_1875.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c279b53-bccd-41de-be07-4fd1a707422a/68358554217.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d22b3cc7-69d3-4107-8dc2-a6448751eb17/it_manager_salary_in_dubai.pdfIn PDF document text
    • https://9a89a7da-ede3-42eb-a537-7416be21eb2d.filesusr.com/ugd/aaaf79_8dec1e43413741d2a67d0953bba37c6b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cff5b89-0092-40fc-ae12-6c59edda126e/auvio_wireless_headphones_battery_replacement.pdfIn PDF document text
    • https://4dd4a32c-aced-41d2-87e6-7ff9ca8080d7.filesusr.com/ugd/6d6f33_dce0d94f63be4733b14693cb88a9d2b6.pdf?index=trueIn PDF document text
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_5dd65c28cf1e4b54835fdaca30c6dc51.pdf?index=trueIn PDF document text
    • https://e60c805d-b9e1-47fc-b045-983511e9ac1f.filesusr.com/ugd/116bb2_23099999140f45a2b6174d1b9a027bd9.pdf?index=trueIn PDF document text
    • https://64f1e6a9-4530-4009-9f9b-67b91dd69f79.filesusr.com/ugd/76b6de_9bfca86a549d4bfaa70856349cd4fced.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_off0000e623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE623 5008 bytes
SHA-256: 661aa0dda8f3242bd013076661ed37d09d9ece4cbc421d15c1ffd01927a6c5c5
font_01_sfnt_off0000f741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF741 10252 bytes
SHA-256: 30a3ad8fe39e5608524e5738ac4d34ff6095ad80c2fe794da6f728b196e4fb3c