Malicious PDF — malware analysis report

Static analysis result for SHA-256 f58d87aeb1ef8919…

MALICIOUS

PDF

43.7 KB Created: 2020-11-06 18:48:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: f988d74ce10f2efd4ee7eedb2bbab89c SHA-1: 44eed46e3e509079840046568d0e00e1278ecbbd SHA-256: f58d87aeb1ef89191c2b403e2511d0932ee4ff06c0101d473c1638348427be6b
176 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://trafffi.ru/aws?keyword=allow+app+to+install+windows+10 PDF link annotation
    • https://bufazori.weebly.com/uploads/1/3/4/3/134377245/3770904.pdfIn PDF document text
    • https://pekedilude.weebly.com/uploads/1/3/4/3/134324883/vakelunef-gufev-wepusizaw-siwoxupovones.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/rowesovi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7161304-9aec-42fb-ac47-ddddd39d73b7/75197737704.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a91bfab0-5930-4530-aa58-7a73335478ba/nidupugivirorujilujoxe.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/catalogo_jequiti_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c88e0858-e7d1-4d2b-81c4-0dd42a9dce18/muzilawal.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/watching_tv_makes_you_smarter_intended_audience.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e735c741-af54-46ea-bcde-582f3666f6ba/tidosutufiwolopomazape.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/bereseloresamuvujojavazis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71ad9154-208a-49de-8f99-1bb8217774a1/89624518184.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5fa1c6c-d2b5-4ec0-9b1a-2411c68f966a/vinolox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d7720fe-c956-4afc-9888-f332cdd91cb4/chinese_porcelain_marks_two_blue_circles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ccfcce9-e060-4874-9617-afd8ab3efad5/different_religions_explained_for_kids.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9560ced-b755-4fa3-b25b-e5e887b307b4/pesorobeju.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_off0000692d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x692D 5132 bytes
SHA-256: 322a81a319e622ea63f0be7f754d1fc4e5ca6cc99d3c238f68aa6c915e335780
font_01_sfnt_off00007acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7ACC 11480 bytes
SHA-256: b83f59e0d34adb89c09b397072d308078910942ac48292caeda7029a7916432c

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