Malicious PDF — malware analysis report

Static analysis result for SHA-256 6df40a27941dfab6…

MALICIOUS

PDF

80.8 KB Created: 2021-03-14 02:49:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 7481988b3dd51eebe5b7c5131282dcad SHA-1: 45531cdc8f59ca4142bf5612f2aefb0c188867d0 SHA-256: 6df40a27941dfab65ed86107dde1e7b356a608bf6afeebd8a0248bfdc688c18e
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to templates. The presence of numerous embedded URLs, many pointing to disposable hosting or unknown reputation sites, indicates a link farm designed to distribute further malicious content or phish for information. No scripts were extracted from this sample.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/123?utm_term=simple+weekly+gantt+chart+template In PDF document text
    • http://xirixakexove.iblogger.org/romeo_y_julieta_reserva_real_minutos_petites_review.pdfIn PDF document text
    • https://diwijavel.weebly.com/uploads/1/3/4/6/134691177/wobizije.pdfIn PDF document text
    • https://zozutogumudeke.weebly.com/uploads/1/3/4/4/134440166/worukufe.pdfIn PDF document text
    • https://kurasapar.weebly.com/uploads/1/3/4/9/134902571/42b46cd5f742b7d.pdfIn PDF document text
    • https://makigutezun.weebly.com/uploads/1/3/4/7/134707077/ximogavaxagu.pdfIn PDF document text
    • https://soferivajateru.weebly.com/uploads/1/3/4/6/134650686/xigusijowipifed.pdfIn PDF document text
    • https://cdn.sqhk.co/silakozafi/sjhRVge/zopin.pdfIn PDF document text
    • https://cdn.sqhk.co/wigetoxeveka/usjgehh/dragonvale_dragons_compatible_with_enhancements.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452608/normal_6029463aa4d2b.pdfIn PDF document text
    • https://cdn.sqhk.co/purawewus/Xjj7jjW/pikuxuje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488330/normal_5fd930c863bef.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/Xijihg9/droid_depot_app_not_working.pdfIn PDF document text
    • http://jinijazutafenix.22web.org/avarampoo_movie_comedy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/scratch_2._0_offline_editor_458._1.pdfIn PDF document text
    • http://nudifezidezi.rf.gd/always_with_me_piano_sheet.pdfIn PDF document text
    • http://faxanudof.epizy.com/probenecid_mecanismo_de_accion.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/24095084839.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_off0000fcbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBF 5528 bytes
SHA-256: dfa1791e6168fc17a6edbfa25495b56048666e2b1282f885f1b952ca7445d609
font_01_sfnt_off00010f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F80 10824 bytes
SHA-256: 48aeeb5df39d3ac7f2b01994dbc427fde226eb2a1e5f2efea7b07ed8af595026

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