Malicious PDF — malware analysis report

Static analysis result for SHA-256 25b82c6028029948…

MALICIOUS

PDF

79.1 KB Created: 2021-06-07 19:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0578534e9d3304eaca7f6b48f5919561 SHA-1: c18c83381a1d7f09b2bd650d972254d9d723c5fc SHA-256: 25b82c60280299489a67fd7c92ab01cd0f88495b9b5ca502a7b3788d1f38db57
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://huntic.ru/pbw?utm_term=cheat+the+sims+freeplay+android+2020+indonesia PDF link annotation
    • https://sojimivur.weebly.com/uploads/1/3/4/8/134883767/b60b2751b9.pdfIn PDF document text
    • https://tezogikezuvar.weebly.com/uploads/1/3/4/5/134584113/1280181.pdfIn PDF document text
    • https://vamofelew.weebly.com/uploads/1/3/5/3/135398798/2365260.pdfIn PDF document text
    • https://zedazepofa.weebly.com/uploads/1/3/0/9/130969939/3787067.pdfIn PDF document text
    • https://fatagodudun.weebly.com/uploads/1/3/4/3/134327877/9e47b236bc114.pdfIn PDF document text
    • https://viriparerari.weebly.com/uploads/1/3/5/9/135978168/gosumalo.pdfIn PDF document text
    • https://kawokuxaletufe.weebly.com/uploads/1/3/4/3/134345859/836b79074.pdfIn PDF document text
    • https://zonixaroponovan.weebly.com/uploads/1/3/1/3/131398400/9747967.pdfIn PDF document text
    • https://dilabugesoko.weebly.com/uploads/1/3/4/6/134627797/9604097.pdfIn PDF document text
    • https://tojisoma.weebly.com/uploads/1/3/5/3/135330836/7177024.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/aa484398-6e5c-47c7-ac21-47206eeadd8d/wazepefavijowijigefeguke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95454f2d-c498-4ecb-8bbe-7c407539db14/4720325516.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3024561b-073a-4235-ae27-77c67105a605/best_romance_books_2020_fiction.pdfIn PDF document text
    • http://nubuzefi.pbworks.com/f/michael_pollan_food_rules_an_eaters_manual.pdfIn PDF document text
    • http://rimikupababo.pbworks.com/w/file/fetch/144535062/school_of_alexandria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fb5f0aa-1754-4641-be31-a5325e12d3ce/wendys_plantiful_burger_nutrition_facts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46e6a71b-fff1-45da-9f68-dca780a80e1b/2005_dodge_ram_1500_doors_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bab1165-4ddf-4fe6-9565-aa3f5914ed44/veras.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b07b603-d5c9-4ff2-9b90-12c3160a3f08/66831800459.pdfIn PDF document text
    • http://mumubib.pbworks.com/w/file/fetch/144413712/active_and_passive_voice_exercises_for_ssc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77661389-3020-4c8e-a4bd-05545a9fb82d/12628047143.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edf9ae10-2f8c-4c63-9240-b6d909912cd9/how_to_use_attachment_on_hoover_steamvac_dual_v.pdfIn PDF document text
    • http://kalejesezuda.pbworks.com/w/file/fetch/144742581/element_3d_v2_2_license_file_free_download_for_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84d62d22-6a9c-4d52-9fa4-b404e24e05e5/58122630299.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/f/30753926711.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_off0000ed5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5F 5560 bytes
SHA-256: 631290137c58cbaa38f8fcd706d2a008d55f45aa698350a776983020e63c4793
font_01_sfnt_off00010022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10022 14080 bytes
SHA-256: 49a5c754dffc471569127ed33958c89047f2a20256306d1cab755028e4bbf0b5

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