Malicious PDF — malware analysis report

Static analysis result for SHA-256 258516fed70f5fde…

MALICIOUS

PDF

84.6 KB Created: 2021-03-23 09:53:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 70b6cbd1b329a399552f155ebbb5f7f2 SHA-1: f2fda020944a9d8f644bc40b7333894a6a5d2387 SHA-256: 258516fed70f5fde1236c677259beeb0284c45050540b7fbb08a97879a8c70fd
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://seumenha.ru/strik?utm_term=bose+901+equalizer+service+manual PDF link annotation
    • http://jokebixa.22web.org/13373967748.pdfIn PDF document text
    • https://gesofomudejow.weebly.com/uploads/1/3/4/3/134344239/9262195.pdfIn PDF document text
    • https://mifugitosa.weebly.com/uploads/1/3/4/6/134631290/dobod_bexedupaxituje_xavabex.pdfIn PDF document text
    • http://difavusimope.iblogger.org/canadian_girl_guide_cookies_vegan.pdfIn PDF document text
    • http://lozuzaragujeb.mypressonline.com/prvi_svetski_rat_knjige.pdfIn PDF document text
    • https://pajowivi.weebly.com/uploads/1/3/4/9/134904739/587a9db263.pdfIn PDF document text
    • https://jikumudepopojet.weebly.com/uploads/1/3/1/4/131453433/belojovavobifa_luvajonumaz_bikolaxipebod.pdfIn PDF document text
    • http://dawexefif.getenjoyment.net/52100795158.pdfIn PDF document text
    • https://lafotavesa.weebly.com/uploads/1/3/4/6/134633764/sexogepemukifor_verujejeki.pdfIn PDF document text
    • https://nalusopiko.weebly.com/uploads/1/3/3/9/133997408/venawewerod.pdfIn PDF document text
    • https://zuvixane.weebly.com/uploads/1/3/0/9/130969636/pifusebudipupujive.pdfIn PDF document text
    • https://xolijusir.weebly.com/uploads/1/3/4/0/134016651/76e0f0334.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/96090312-73dd-45ab-ab87-1d691c4c5af4/86190798633.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e170223-d227-4f25-98f1-4bec0f2659e5/18869099604.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/33637009617.pdfIn PDF document text
    • http://muzubakow.epizy.com/observational_drawing_exercises_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/08_jeep_grand_cherokee_headlights.pdfIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/32589733349.pdfIn PDF document text
    • http://wokoguzesel.rf.gd/hoover_steamvac_carpet_cleaner_how_to_use_hand_tool.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ece074fc-cfb7-4987-b176-b2a26794a835/el_escudo_simbolo_nacional_de_costa_rica.pdfIn PDF document text
    • http://mawidinivetobi.myartsonline.com/divine_comedy_poem.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/70046012692.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011950.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11950 23304 bytes
SHA-256: 957355c08eea5eb9a5a0464226a1ce6ba4254160f44917fdd0d2d9f70374bc20
font_00_sfnt_off0000df31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF31 5580 bytes
SHA-256: 7e9979ec52e08b35f701e90acdee9d141c7144e0f14f7c7cc3c2bbc777198778
font_01_sfnt_off0000f231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF231 11552 bytes
SHA-256: b554dd47a38f9ac04628d622a962c751648b5e95e624bd49cc1c4ddb927e976c