Malicious PDF — malware analysis report

Static analysis result for SHA-256 56d9f83b9df50786…

MALICIOUS

PDF

77.3 KB Created: 2020-11-18 15:18:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3be8e7c860d5f38a2c0b695484653f5c SHA-1: d828b054e44f114a7edcbdb1d411bb68c4723b27 SHA-256: 56d9f83b9df50786dba803535a8ffffafcff146549319f11c68fc1e40e4a5fc7
156 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 0.9998

Heuristics 5

  • 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.
  • 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://traffnew.ru/strik?utm_term=the+witcher+3+nude+mod PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402724/normal_5fb2a28a69196.pdfIn PDF document text
    • https://fomikozifu.weebly.com/uploads/1/3/4/5/134511133/33412.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481516/normal_5fa70c9eb43fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414515/normal_5fac36566d41f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481539/normal_5fb29e1de84c5.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/5092c227-3f5f-40ac-a774-38616466607e/the_conjuring_2_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3a04666-2202-4098-b971-d923d9d10c67/40304360170.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae077174-b6cd-4b79-9325-3707bb7aced1/sevtech_ages_download_tlauncher.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09c5e07b-6881-4152-859f-821d5d90f4a2/38122191603.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb5d1581-464c-4961-a35c-04ee9d011f57/sebastians_kitchen_nightmares.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1e647e8-d421-4065-ba2a-72fcd57cc785/85176107632.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0d9df2a-f932-4e01-b681-9ea981e94d79/50_50_challenge_anime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caf4b736-73ed-4b34-91cc-34749b33215a/ccna_final_exam_answers_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97c12637-6733-47b5-87f1-7079bfc344ff/sixuxonejedet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b69df10f-492c-4cc4-817f-4c495fb04555/worexogaxagomutiwido.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_off0000ef44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF44 4964 bytes
SHA-256: 4f21ec6843bcbad7eac17b0c1a09f04339f26351d42d98f7216bf5bce100a6b9
font_01_sfnt_off00010014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10014 12620 bytes
SHA-256: 16590c0ad5a3a048650d424b59ec28dd964fcd9be1627cabe57b47acdc2ecd5d

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