Malicious PDF — malware analysis report

Static analysis result for SHA-256 0521946ff056563c…

MALICIOUS

PDF

79.1 KB Created: 2021-03-12 22:03:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12575ddb0fa366e30254ec910f71e837 SHA-1: 83875620fa940a52ba8cbf24d6c106ece0514006 SHA-256: 0521946ff056563ccad7da9df66db1ddf9f4bba50a730a49ae17653fc40c9bb7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to seemingly unrelated PDF documents, indicative of a link farm or SEO poisoning tactic. The primary URL, https://mezovuduw.ru/award?keyword=bronchodilators+classification+pdf, suggests a lure related to medical classifications. ClamAV and ML classifiers strongly indicate maliciousness, specifically a phishing or trojan distribution attempt. No scripts were extracted, but the extensive URI usage points to a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/award?keyword=bronchodilators+classification+pdf
    • https://bizotimugir.weebly.com/uploads/1/3/1/1/131164076/8281154.pdf
    • https://banukusisazej.weebly.com/uploads/1/3/4/8/134893357/dolunuvejanekifeni.pdf
    • https://cdn.sqhk.co/lelabepena/ehgieie/buddhismus_buch.pdf
    • https://cdn.sqhk.co/zijopenuxafi/gjOhgYw/infinity_gauntlet_omnibus_reading_order.pdf
    • https://cdn.sqhk.co/waxusuxagaki/hcpqhfW/jenevefuwimiligerufu.pdf
    • http://agent-ritual495.online/lynx_lake_lodge_for_saletwgpz.pdf
    • https://cdn.sqhk.co/kulizuxekume/nPDjgKe/zanawiponotamati.pdf
    • https://cdn.sqhk.co/zojixemem/riabj2R/23297763111.pdf
    • https://xixozikitep.weebly.com/uploads/1/3/4/0/134097223/bobokemawujoxa_watuwino_tegiforakam_jakaves.pdf
    • http://yandex-dostav.ru/alaska_carry_on_size_limitmbbw6.pdf
    • https://wipigoxexidon.weebly.com/uploads/1/3/2/6/132682030/vorufigukur_mogek_zudewokufasapak_pufaxafibi.pdf
    • https://cdn.sqhk.co/nububufi/gcrjhUd/kuzanu.pdf
    • https://cdn.sqhk.co/naziwixolagu/yibiho3/xafobori.pdf
    • https://cdn.sqhk.co/vamunidibu/VG3tZf7/kodifumo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mejavifoxeb.rf.gd/12546754332.pdf
    • https://s3.amazonaws.com/jesidofefe/reference_request_letter_template_from_employer.pdf
    • https://s3.amazonaws.com/jolunenafobuw/vilokubuvav.pdf
    • https://s3.amazonaws.com/tiluwisulepam/57418135765.pdf
    • http://tunufefenus.rf.gd/carpobrotus_acinaciformis_wikipedia.pdf
    • http://poxelisenaxoxig.epizy.com/probability_tree_worksheet_tes.pdf
    • http://kadinox.epizy.com/bridge_over_troubled_water_song_free.pdf
    • https://s3.amazonaws.com/jonora/piwopoxax.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9b8.bin
fdccc06f68dbbe9122b6aa428b30f952d42b5e3f446df3a6291d3d90bf0e5ab0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B8 5292 bytes
font_01_sfnt_off00010bb1.bin
299de80fc7eb0be1b2045c8a62f328f4364b4ba7fe5efdb2c93deae441b188c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB1 10396 bytes

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