Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4c0539c97f4652f…

MALICIOUS

PDF

69.0 KB Created: 2021-01-19 16:52:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 46822c651a4efecd317934955c92a963 SHA-1: b35d5ed70dab1419a8e28c22fc076149e0a7eae5 SHA-256: f4c0539c97f4652fdea553c1573a4232ff4fa2d4a45a50d4e4fe6a8c4fadd523
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically identified as a redirector. The document body, though heavily obfuscated, contains text related to a 'Photographer's guide to the nikon coolpix p900 pdf download', suggesting a lure to disguise the malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness, likely for phishing or malware distribution.

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://traffine.ru/123?utm_term=photographer%2527s+guide+to+the+nikon+coolpix+p900+pdf+download In PDF document text
    • https://site-1174122.mozfiles.com/files/1174122/nugudefigopelajeraze.pdfIn PDF document text
    • https://site-1227117.mozfiles.com/files/1227117/96094282604.pdfIn PDF document text
    • https://site-1176684.mozfiles.com/files/1176684/bombay_dyeing_cotton_bed_sheets_offers.pdfIn PDF document text
    • https://site-1255224.mozfiles.com/files/1255224/libro_administracion_financiera_contemporanea.pdfIn PDF document text
    • https://wanuzixa.weebly.com/uploads/1/3/1/4/131482886/9755953.pdfIn PDF document text
    • https://nodifolosorak.weebly.com/uploads/1/3/4/7/134758422/dugekupap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450047/normal_5fff6f1567928.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467564/normal_5fdba29fa20c4.pdfIn PDF document text
    • https://site-1174689.mozfiles.com/files/1174689/alien_shooter_cheats_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401703/normal_5fe58a0c0b7fe.pdfIn PDF document text
    • https://site-1174602.mozfiles.com/files/1174602/67233966912.pdfIn PDF document text
    • https://birebojutadavom.weebly.com/uploads/1/3/4/3/134342015/keziganabavuzejov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366652/normal_5f92b214c396a.pdfIn PDF document text
    • https://nunezujotegu.weebly.com/uploads/1/3/4/3/134312528/zifonefajitiz-lekopaputunujig-sadijixina.pdfIn PDF document text
    • https://site-1178774.mozfiles.com/files/1178774/91680878852.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426422/normal_5fdb5f817fe8c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413838/normal_5fcd749c59dd1.pdfIn PDF document text
    • https://site-1179234.mozfiles.com/files/1179234/vuxanawewarefuvamakowuji.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_off0000cd65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD65 5976 bytes
SHA-256: 9ef12a1d08d86949602c5817c5e3f2cc485aeb8228abef79008893b17087cade
font_01_sfnt_off0000e1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D5 10836 bytes
SHA-256: 6e4ee4f278b858fca6f5df7a86c42a588ae8546efd8270e0a5497b743328bc86