Malicious PDF — malware analysis report

Static analysis result for SHA-256 2216d64ea4a824dc…

MALICIOUS

PDF

84.3 KB Created: 2021-01-23 14:04:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: d580368de785a2034e585d0fff635f8d SHA-1: bafb5210782c16f4e16c2ba4881b2a6fa91297ab SHA-256: 2216d64ea4a824dc3749438c2adb4758aafd4f06bf2240e44a34960173a3acf3
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as a link farm, containing a large number of external URLs pointing to various domains, including disposable hosting services. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or to redirect users to phishing or malware-hosting sites. No scripts were extracted, but the sheer volume of external links suggests a coordinated effort to distribute malicious content or manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/123?utm_term=frequency+doubler+circuit+design PDF link annotation
    • https://cdn.sqhk.co/pirasemofoge/aieieIK/entrepreneur_quotes_wallpaper.pdfIn PDF document text
    • https://miwebuzoz.weebly.com/uploads/1/3/4/0/134095964/witedatajufenodiwujo.pdfIn PDF document text
    • https://wemakevarovafa.weebly.com/uploads/1/3/4/6/134636541/tesovanitukos.pdfIn PDF document text
    • https://cdn.sqhk.co/kakumipoman/Tyjdody/85580623589.pdfIn PDF document text
    • http://sifulodidikit.22web.org/resumo_capitalismo_informacional.pdfIn PDF document text
    • https://gutirupivib.weebly.com/uploads/1/3/4/7/134768574/nodowas_lejixuridawux_sorixixemuz_poxotiguwinox.pdfIn PDF document text
    • https://tobevasisutigi.weebly.com/uploads/1/3/0/8/130814636/4704811.pdfIn PDF document text
    • https://cdn.sqhk.co/wanukawuwota/gdgd0wt/space_heater_with_thermostat_walmart.pdfIn PDF document text
    • https://cdn.sqhk.co/fopalixogul/PP6Fpia/73336280308.pdfIn PDF document text
    • https://vaferevipesefur.weebly.com/uploads/1/3/0/9/130969420/75f876404e870.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nisebot.epizy.com/android_decode_bitmap_from_drawable.pdfIn PDF document text
    • http://zoniguzetixan.epizy.com/docket_sheets_california.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48E 5220 bytes
SHA-256: 0abf041da8a3d9782a94f498719009f6e2475136917112577fdf132888245490
font_01_sfnt_off0001065f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065F 12156 bytes
SHA-256: b58b9db22222e4ec1d5aac41a6aa9e7f7f385ddf93c366c580a84273bd413b33
font_02_sfnt_off00013015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13015 16036 bytes
SHA-256: 149cab45689013e99d1aa520d2e5234663aa5d8577b6aae5e423b5d60aeda4c1

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