Malicious PDF — malware analysis report

Static analysis result for SHA-256 4860964a7f38070a…

MALICIOUS

PDF

76.1 KB Created: 2021-06-14 06:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f126e5675088b21b4bd182b433227e98 SHA-1: 064172e118d4b9c6b909d8c65b2d870e7877efab SHA-256: 4860964a7f38070a11323eea3e161705214eb48b024a91bb3a462d4bc30fed50
194 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It functions as a link farm, directing users to various external PDF files hosted on multiple domains, with a specific lure for 'nba 2k20 psp iso'. The presence of numerous external links and the use of disposable hosting suggest an effort to obscure the ultimate malicious destination. No scripts were extracted, but the overall structure points to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/pbw?utm_term=nba+2k20+psp+iso PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375507/normal_60317f8d9ed1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371014/normal_5fda00caaae09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381532/normal_600554dea5c4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489245/normal_603309176fbda.pdfIn PDF document text
    • https://womominajarizu.weebly.com/uploads/1/3/5/3/135392323/8b47bcdc7b73.pdfIn PDF document text
    • https://vadidavulegisiw.weebly.com/uploads/1/3/4/7/134760242/fuxilopat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377095/normal_5ff1753c5dc49.pdfIn PDF document text
    • https://luboguti.weebly.com/uploads/1/3/0/7/130739177/gilefu.pdfIn PDF document text
    • https://nobarolibefo.weebly.com/uploads/1/3/1/4/131407117/zosusekopu_dalivebeg.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/21e5da48-16dd-4af2-a6aa-608e52512a67/outlander_diana_gabaldon_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f53560a7-2c2f-4554-a35f-5a52ee8a344f/novotubuniwaxetof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/604ca938-a800-4209-b633-001fcafb36b5/what_is_the_meaning_of_headship_and_submission_in_the_bible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd805e0e-adf4-43ea-81a9-e552f5fed8a8/how_to_use_hitachi_ac_without_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15759242-1495-4902-9423-d2525207ab91/77588236549.pdfIn PDF document text
    • http://devemidu.pbworks.com/w/file/fetch/145206777/the_cinematic_orchestra_to_build_a_home_piano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d787f26-3f81-4675-9cdc-47d48573e43f/sacrosanctum_concilium_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/082b3713-d0c5-44f6-98f3-7f51a2185c5a/62218887292.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3aa9ae8-10fa-44c3-94dd-c268a55b9afc/99715235142.pdfIn PDF document text
    • http://dumunivuniv.pbworks.com/f/wukela.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_off0000eb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5F 5132 bytes
SHA-256: 6672507680d81d082bafb68375092ddd26623c5b26f6f5551d8c0f8411087c5c
font_01_sfnt_off0000fce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE8 11472 bytes
SHA-256: 5cb9a34fde481c871478018e95fce0d93823241c32114e3ce7b13ad29ddecea4