Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7c4758b1d470b65…

MALICIOUS

PDF

40.0 KB Created: 2020-11-05 15:52:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 902360ab46fd2d35a8da64817ba0c043 SHA-1: 72a0287602c5861a384a7a70605fab7164d3c32a SHA-256: e7c4758b1d470b6525cd85f2915facd390b61c2414492e1b47dc8b4523f10c9b
96 Risk Score

Malware Insights

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

The PDF document is identified as malicious by an ML classifier and contains a large number of external links, many of which are likely part of a link farm. The document body, though partially corrupted, contains text related to a 'Maytag performa washer repair manual' and an embedded URL, suggesting a lure to redirect users to potentially malicious content. The presence of multiple external URIs and the PDF_SEO_LINK_FARM heuristic indicate a pattern of redirecting users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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/aws?keyword=maytag+performa+washer+repair+manual PDF link annotation
    • https://dikoriwapajok.weebly.com/uploads/1/3/4/4/134447187/babuki.pdfIn PDF document text
    • https://rirumuzog.weebly.com/uploads/1/3/4/1/134109041/nadutenom_muxaruxafavob_pajijobolusas.pdfIn PDF document text
    • https://jujizifij.weebly.com/uploads/1/3/4/3/134309807/c631220e2e6c.pdfIn PDF document text
    • https://mogezisatizate.weebly.com/uploads/1/3/0/7/130775403/fexanana.pdfIn PDF document text
    • https://duzuvopewawufos.weebly.com/uploads/1/3/4/4/134491429/11bcb.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/kisimujuk/enrique_iglesias_mp3_songs_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/10086397288.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8a3671a-9031-4852-9b2f-d78b0b7fee83/24509716659.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/marketing_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a56bd6b3-ebdd-4994-833e-4bc8bc0e09d8/until_we_meet_again_song.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/project_management_assignment_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/zijenapixikelojulidalod.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_off00005f8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F8D 5512 bytes
SHA-256: b79373205a9e49044af569ab5e8e044811671e831864ce5f9504f72d81d73fc4
font_01_sfnt_off00007247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7247 9760 bytes
SHA-256: 8336e7875797ddc8503211218ac4e7aef89bc4e8fc936e8bab82e64b396b023c

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