Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ea21fcb9caa3f73…

MALICIOUS

PDF

81.9 KB Created: 2020-12-18 01:02:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 6c28161fec905028410172aea5798b76 SHA-1: c696c446e67d86a4c890579aecc098d6660b232a SHA-256: 3ea21fcb9caa3f7304d5d82c74dd76cc836a6e27844508317cbf1af427e26e47
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to seemingly unrelated content, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate maliciousness. The embedded URLs likely serve as lures to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://trafficel.ru/aws?utm_term=mindhunter+netflix+parents+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470231/normal_5fd6381b846ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485329/normal_5fc3fc2b9733d.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/059d55fbff3.pdfIn PDF document text
    • https://jutivodip.weebly.com/uploads/1/3/4/4/134489611/bodakoberakos_somugowuvujewu_tawisele.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/gezizefefififa/94714923403.pdfIn PDF document text
    • https://s3.amazonaws.com/digigitusuduk/2197055595.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2b1c5239b0722913cd72f/t/5fc7e0aae2d0360af45bd38e/1606934698296/98202184781.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/me_marketing_essentials_online_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/exception_handling_in_oracle_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/zilobalerevumipovugeporu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6addd0a2757459b0b5f1a/t/5fd63e63ffab5d3c56f53197/1607876195609/ambulance_uniform_tax_rebate.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_off000102d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D1 5376 bytes
SHA-256: 497cf3e36511691ea8e040821f04c1247395aa168a1705f2eb583046da340b8e
font_01_sfnt_off00011526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11526 10624 bytes
SHA-256: 993615f1468489702cae9d72fb15dd15775d3b15f067b909b1787eebc81c92e3