Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5da5748cc00e253…

MALICIOUS

PDF

75.1 KB Created: 2021-02-25 00:26:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: fcbd90b68a2bc3c59ab3ebfe3e2cbad2 SHA-1: eef5487dddc73c72953409b04e1f30fc6b24e5b0 SHA-256: b5da5748cc00e2536e3c7fdaed633f5dacf5a21bdbc93d5fa3f8e91da03cb0e9
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains and potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this file as malicious, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the structure and heuristics point towards a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/123?utm_term=dolor+en+las+mamas+a+que+se+debe PDF link annotation
    • https://cdn.sqhk.co/wegodimumod/iaEiqjc/jadujil.pdfIn PDF document text
    • http://tomolijoponix.mypressonline.com/zte_warp_elite_wont_turn_on.pdfIn PDF document text
    • https://cdn.sqhk.co/nomelafu/Istjcjf/50099501509.pdfIn PDF document text
    • https://cdn.sqhk.co/pugirunosamo/pPnggEZ/mastermind_group_names.pdfIn PDF document text
    • https://niguzagum.weebly.com/uploads/1/3/5/3/135390192/menuwuvoz-dunaf-gazixurevija.pdfIn PDF document text
    • https://cdn.sqhk.co/takivelalam/iaifahg/zikazipulej.pdfIn PDF document text
    • https://xoxomupufolud.weebly.com/uploads/1/3/0/9/130969418/kukutigadopasixazegi.pdfIn PDF document text
    • https://cdn.sqhk.co/rogenujudita/iaDuJjf/kung_fu_panda_dragon_warrior_poster.pdfIn PDF document text
    • http://wegijezunulej.22web.org/rounding_to_2_decimal_places_worksheet.pdfIn PDF document text
    • http://zawugudumi.getenjoyment.net/which_stock_broker_is_best_in_malaysia.pdfIn PDF document text
    • https://cdn.sqhk.co/mibemofega/djc5QAj/86104017944.pdfIn PDF document text
    • https://woniwisupu.weebly.com/uploads/1/3/4/2/134266019/2331671.pdfIn PDF document text
    • http://xuvaxujogilo.mygamesonline.org/99244871150.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://japinoxizidunub.myartsonline.com/how_to_remove_adt_panel_from_wall.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/kidde_kn_cosm_ib_chirping.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_off0000e55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55B 5236 bytes
SHA-256: 8450ac66baf0b262f15424f5534229dbc86a1c3451ab4bea18081c31c00909c1
font_01_sfnt_off0000f70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70A 11804 bytes
SHA-256: 2a09286b6e09356169d14320823fc1d1e56f9cd6e68faa050f31d293a43db29f

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