Malicious PDF — malware analysis report

Static analysis result for SHA-256 1791b2f3305e5294…

MALICIOUS

PDF

52.2 KB Created: 2020-11-07 01:57:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 9e331aa7f208bc4e5340e89f85a80bd6 SHA-1: a028ae37310ca266222b600eeeb9acd29f83764f SHA-256: 1791b2f3305e52945fb2f8e0361a0dc07c12b31456fd63bfe469da18934a1ab9
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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=mariachi+sheet+music+violin PDF link annotation
    • https://fatatarulawug.weebly.com/uploads/1/3/4/4/134474158/tawagevojatusojupix.pdfIn PDF document text
    • https://xulajaxosu.weebly.com/uploads/1/3/4/3/134366267/bokititotujizum.pdfIn PDF document text
    • https://birebojutadavom.weebly.com/uploads/1/3/4/3/134342015/624050.pdfIn PDF document text
    • https://muxamaxipusitu.weebly.com/uploads/1/3/4/4/134470051/sifojomur.pdfIn PDF document text
    • https://didipovewefof.weebly.com/uploads/1/3/4/3/134306756/5907380.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/rodigapigeta/somar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58a25349-9327-4aa6-a3bb-99c4f65335e6/39458470067.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/pc_apk_download_sites.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/meme_maker_online_no_watermark.pdfIn PDF document text
    • https://sakazedeg.files.wordpress.com/2020/11/25933203693.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/82762272552.pdfIn PDF document text
    • https://xobonub.files.wordpress.com/2020/11/polamilur.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/umn_spring_break_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/war_robots_cheats.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000791f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x791F 5104 bytes
SHA-256: a7c8a85f0e777993c0fdcfc54c6e45217f6897344985e50df6049182578e53a0
font_01_sfnt_off00008a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A60 10696 bytes
SHA-256: 90cc0649f7d847821bf6fe16afc4c43c51ff20f37ae410c066dc430ea4d0ef1b
font_02_sfnt_off0000aea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA3 16100 bytes
SHA-256: dbe3dd64dc066f428802739f18684eaf08c446fcda8cbe88d420f1ef9ee6b29b

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