Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a992f9054873413…

MALICIOUS

PDF

79.2 KB Created: 2021-03-25 21:55:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f07b3f0183ef13cdd040e3558b8279e3 SHA-1: 114df86583a582a8d33edf0a1d0fd77f1b5f7b77 SHA-256: 4a992f905487341376004705c3db4ddb0e3ecd7dee099db51c7cba0999f3f1fd
186 Risk Score

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 0.9993

Heuristics 6

  • 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.
  • 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://resalured.ru/award?keyword=resignation+letter+format+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/feletitami/rhaicUF/85590714013.pdfIn PDF document text
    • https://cdn.sqhk.co/jejekije/bHEA9CH/free_download_insta_chat_apk.pdfIn PDF document text
    • https://bawimadesudife.weebly.com/uploads/1/3/4/3/134363746/8337538.pdfIn PDF document text
    • https://gepavemu.weebly.com/uploads/1/3/4/8/134861499/vapulizep.pdfIn PDF document text
    • https://cdn.sqhk.co/firumefetev/jgcA0ia/rumble_on_stock_split.pdfIn PDF document text
    • https://cdn.sqhk.co/joxesinejag/gdtkCij/nickname_generator_discord.pdfIn PDF document text
    • https://cdn.sqhk.co/fikalibumi/gghipjh/63259241997.pdfIn PDF document text
    • https://cdn.sqhk.co/dubibuwa/dJdichj/86379850339.pdfIn PDF document text
    • https://cdn.sqhk.co/rorezina/EtIjd0f/tom_and_jerry_characters_name.pdfIn PDF document text
    • https://cdn.sqhk.co/surofowudula/UJ4NijB/pencil_skirt_plus_size_malaysia.pdfIn PDF document text
    • https://wobanuwu.weebly.com/uploads/1/3/5/9/135959505/3921629.pdfIn PDF document text
    • https://kuginipa.weebly.com/uploads/1/3/4/8/134853520/bc5d1a.pdfIn PDF document text
    • https://cdn.sqhk.co/wosipuvetot/hbUVhig/the_sims_mobile_online_or_offline.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/OHjfjgv/xokojiwizibedo.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/gudukupir/69229660385.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/tozufuxibokizojo.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/thinking_with_type_ellen_lupton.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/coreldraw_full_version_bagas31.pdfIn PDF document text
    • https://s3.amazonaws.com/tomaxade/acrobat_9._5._5_update.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/96681476164.pdfIn PDF document text
    • http://lifuwopokul.rf.gd/sherlock_holmes_full_movie_download_filmyzilla.pdfIn PDF document text
    • http://xegiseko.epizy.com/jewik.pdfIn PDF document text
    • http://gizagagex.epizy.com/acute_otitis_media_stages.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/taylor_swift_speak_now_album.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_off0000f7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D6 5460 bytes
SHA-256: 685807b16027ac2df0d00ff7bcaf2e9bf1a7bf2a9aace261170fecf87306f0a4
font_01_sfnt_off00010a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6D 10760 bytes
SHA-256: 69655922aaf113849aa542f3aff743219f9194290602ace10a935ec4f7fc8ebc

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