Malicious PDF — malware analysis report

Static analysis result for SHA-256 272b030e0fb0e28e…

MALICIOUS

PDF

83.3 KB Created: 2021-02-06 16:29:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3dbf05dbb39b17bc4c6cd5f2ee44e962 SHA-1: d3ec7c83b7ea944677c589242605ca4566abe185 SHA-256: 272b030e0fb0e28e86ccb5fe6e762cf6ab6fe0e2bed1319abb9229f9de464b64
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of embedded links suggests an attempt to direct the user to external malicious sites.

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://yafferge.ru/aws?utm_term=ganesha+atharvashirsha+pdf+tamil In PDF document text
    • http://pmaider.com/kaxogozepexopirifiwamazol4t26d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451220/normal_5ffbd32b009b3.pdfIn PDF document text
    • https://cdn.sqhk.co/marixefe/bheii66/6228141107.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470977/normal_600a86cd433be.pdfIn PDF document text
    • http://raifaisentapp.online/vogogupusukmokl2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479673/normal_5fdba0636181a.pdfIn PDF document text
    • http://alania365.ru/vupakusesinikividuvinakuqzn0g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411001/normal_60117c27b8da2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385887/normal_5fc5c5c19032a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://pigozezidum.rf.gd/android_mobile_in_5000_rs.pdfIn PDF document text
    • http://sivigowukom.epizy.com/joguvazikesujemilodoxa.pdfIn PDF document text
    • http://tujiritam.epizy.com/chloroform_bacteria_water_test.pdfIn PDF document text
    • https://s3.amazonaws.com/juvosi/exercise_stock_options_tax_reporting.pdfIn PDF document text
    • http://gejofizax.rf.gd/29068043901.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/19811099612.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF973 5372 bytes
SHA-256: 256db96f5e9ad93e397a5c2800f81e561503007226a1128947ce761f8a2b6a18
font_01_sfnt_off00010b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B94 3404 bytes
SHA-256: 47f6f0a41558eb32e3a16c70b50b4299cc9b23ead4e83c4eaa52f462bca00006
font_02_sfnt_off0001181c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181C 12800 bytes
SHA-256: 74911a8a78de9494926c62b810f53bf4b1f4041b9abc6fb3a2fb8745f703fb6f

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