Malicious PDF — malware analysis report

Static analysis result for SHA-256 67655f2f89731b98…

MALICIOUS

PDF

78.8 KB Created: 2021-02-15 15:33:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f5139ae6010fca39aab4424c0260c848 SHA-1: e0a6b6115ebeccf2fdb5242045a54bf434f0a2a7 SHA-256: 67655f2f89731b9815fe2c99e638342b68aaf6ddf2032a04089e36105629dc2d
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links that redirect to external websites, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to direct users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://crophysi.ru/wb?keyword=social%20psychology%20experiments%20on%20conformity In PDF document text
    • https://cdn-cms.f-static.net/uploads/4452206/normal_5fd9ae37bd40d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405459/normal_6007d307a46c5.pdfIn PDF document text
    • https://cdn.sqhk.co/movumatoz/ii2Egho/free_mp3_downloads_for_iphone.pdfIn PDF document text
    • http://betmoy56.com/cyberfoot_2015_indirr7iti.pdfIn PDF document text
    • https://cdn.sqhk.co/kosibowo/7gh009i/lasunedonuxi.pdfIn PDF document text
    • https://rewumakabaw.weebly.com/uploads/1/3/4/8/134856880/zutulukiwasi.pdfIn PDF document text
    • https://bivunuse.weebly.com/uploads/1/3/5/3/135392281/dozudijodisog.pdfIn PDF document text
    • http://rolevuses.iblogger.org/rest_api_documentation_template_markdown.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485005/normal_60257ba568c8c.pdfIn PDF document text
    • http://skidki-day.store/97507399691qzxmh.pdfIn PDF document text
    • http://icily.xyz/bombay_dyeing_diwan_bed_sheetsv5f6h.pdfIn PDF document text
    • http://topvideo.design/vikukipupadebokinatafoega94.pdfIn PDF document text
    • https://lebetazukuz.weebly.com/uploads/1/3/1/6/131606644/zepijafobasa.pdfIn PDF document text
    • https://cdn.sqhk.co/gejupajo/diggdji/crossing_over_takes_place_in_mitosis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393890/normal_6015fde87a3a4.pdfIn PDF document text
    • http://all-host.site/chipper_and_sons_lumber_covohnw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487905/normal_5fc64cbade9ba.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/sizadagazagaj/18_gauge_stainless_steel_sheet_pan.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/37028374330.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/data_analysis_add_in_excel_2010.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_off0000f431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF431 5704 bytes
SHA-256: 8f5defa0b72f20f4550d207b33601467f1e6869b6059428013098b167f06c4c8
font_01_sfnt_off00010780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10780 11368 bytes
SHA-256: 3e176f55cf1729a0a54a905f2f7c3ab7c4ef4e73f276630afb496622d9819b49

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