Malicious PDF — malware analysis report

Static analysis result for SHA-256 c935ccbe0ddc12d6…

MALICIOUS

PDF

82.7 KB Created: 2021-03-28 06:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 794f286635ca19489966820a1dc97d99 SHA-1: fcf533ec7c51f4eeeed5388570a0374f335c6a4f SHA-256: c935ccbe0ddc12d6a25dee476ee478d33755b11ec67d5caac12c2b33a50745b1
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, as malicious and a phishing attempt. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to distribute malware or phish for credentials. The document body, though heavily obfuscated, appears to be a lure related to business plans, further supporting the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/award?keyword=business+plan+and+proposal+writing+pdf PDF link annotation
    • https://cdn.sqhk.co/zegareguw/ie1gdhg/shareme_file_transfer_app_free_2021_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486994/normal_6022d0e23045f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459341/normal_60579b3ae58f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368741/normal_603fe480ed65f.pdfIn PDF document text
    • http://kihepc.xyz/974969366440y5ea.pdfIn PDF document text
    • http://redtea.space/gezupupebuzunupitudevuwopb836r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416510/normal_6015de8baa127.pdfIn PDF document text
    • http://strongcreditscore.info/philips_gogear_vibe_4gb_mp3_player1jope.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375708/normal_602ed1e2cfbfb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405437/normal_5fed572ae4680.pdfIn PDF document text
    • http://rodina38.ru/15036374365mbabh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452853/normal_5fd1f4848d032.pdfIn PDF document text
    • https://cdn.sqhk.co/lodikorep/xJ70jcP/capitol_theatre_yakima_washington_events.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486994/normal_60212756b693e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454672/normal_6021079fe2052.pdfIn PDF document text
    • https://cdn.sqhk.co/dilizilozok/huhcqhd/93862989664.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446921/normal_5feb194bbf60a.pdfIn PDF document text
    • http://site-shop.xyz/whirlpool_quiet_partner_ii_wont_turn_onhxqcr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453335/normal_60150fa6b9258.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420025/normal_6015c9f89dc58.pdfIn PDF document text
    • http://daddytestit.xyz/fexudepukomezamugikejp19hb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0001056a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056A 5348 bytes
SHA-256: 1afbeec16c668c492571d894c0a3ce8e4fa429c5889e41a3592473c9f9a293ba
font_01_sfnt_off000117bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BF 10848 bytes
SHA-256: a878d8da084554f1fe8ed99c64d2cf3991896e171e914c2cf00a8af174b22670

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