Malicious PDF — malware analysis report

Static analysis result for SHA-256 19933e8eb4689368…

MALICIOUS

PDF

77.8 KB Created: 2021-02-24 22:44:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ee08b6ed180c9f2b08a6fdcb173c6895 SHA-1: 75e0d11da34d0fba44f25a8e1d3dd1951cf6b5fa SHA-256: 19933e8eb4689368f597ef2d9823dbf5b78247b6c7d1aca3e3e7215c18a2932e
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, with the document likely serving as a lure to download further payloads or redirect to phishing sites. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' confirm the attack pattern.

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
  • 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://jacksth.ru/strik?utm_term=how+to+reboot+moto+g+3rd+generation PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4469359/normal_5ff3d879b16c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476421/normal_600e43ff1133c.pdfIn PDF document text
    • https://vudunige.weebly.com/uploads/1/3/5/9/135981242/2434574.pdfIn PDF document text
    • http://nipokaxa.getenjoyment.net/serato_dj_lite_1.3_3_macos_installer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384650/normal_5ffff7c4a2251.pdfIn PDF document text
    • https://dosemawa.weebly.com/uploads/1/3/5/3/135388865/1058949.pdfIn PDF document text
    • https://bifomika.weebly.com/uploads/1/3/1/8/131856700/b1b9a.pdfIn PDF document text
    • https://kusijavi.weebly.com/uploads/1/3/4/3/134385668/zonezusugozode.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469643/normal_600ddf1264a1d.pdfIn PDF document text
    • https://zinegekoxemajaj.weebly.com/uploads/1/3/4/7/134767253/riligojivafizixagi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366630/normal_600723a98f06a.pdfIn PDF document text
    • http://sevezor.scienceontheweb.net/19422863237.pdfIn PDF document text
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/niledudarame.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414515/normal_5ff9bc0c150b6.pdfIn PDF document text
    • https://bupudotededifo.weebly.com/uploads/1/3/5/3/135323991/7f624c9533d001.pdfIn PDF document text
    • https://lirurofimel.weebly.com/uploads/1/3/6/0/136088330/mizokadozolupe.pdfIn PDF document text
    • https://livadekawa.weebly.com/uploads/1/3/5/3/135317457/fopijujaruderuf-mirimuxuromosa-wigujevexoseb-tigivikok.pdfIn PDF document text
    • https://vakogupomuniv.weebly.com/uploads/1/3/4/6/134610568/1929161.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pojozija.onlinewebshop.net/sylvania_portable_dvd_player_charger_walmart.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_off0000ef29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF29 5292 bytes
SHA-256: 79fcb2d3c1319d0c61bfcbc0e26277f679115eb68d157037a515b82d474a3f35
font_01_sfnt_off00010123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10123 12404 bytes
SHA-256: daa872d54eea39555d363b13f46ba6bdb598eeda589c1af84bd4d3fa7db1b79b

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