Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4955673f4129eb9…

MALICIOUS

PDF

120.3 KB Created: 2021-02-20 23:13:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 02380f5bbb8d1e1a745b78192058cf59 SHA-1: 16034d269514ae7f8fe85a4d6d71a95f0c4c2fd0 SHA-256: d4955673f4129eb9ab0ba83c462ad25fcb4fd6d7f6dadbd5fa19b86d45753f7c
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the presence of many external links points towards an attempt to direct users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/aws?utm_term=dark+sun+campaign+setting+2nd+edition+pdf PDF link annotation
    • http://7lessons.site/renomajirowagomarifuva2rsab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381291/normal_5fd2a03d4adf2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422876/normal_5fd9357a4c39b.pdfIn PDF document text
    • http://hiziryigit.online/libitipirad7ynnj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493917/normal_5fda7f620dafa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411229/normal_601671fa26582.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422645/normal_60305ba692660.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467573/normal_5fd1ffe09a531.pdfIn PDF document text
    • http://axecheat7.xyz/piriformis_syndrome_sitting_in_carw6r1j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419235/normal_5fe675ddc7fc9.pdfIn PDF document text
    • http://stavki.link/deixis_exercises_with_answersabzt6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417212/normal_5ff8c465133f5.pdfIn PDF document text
    • http://madamzero.com/dibujos_para_colorear_princesas_disn11f1k.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475215/normal_600891229afd2.pdfIn PDF document text
    • http://kigowamukidiba.iblogger.org/53137011678.pdfIn PDF document text
    • http://desekikimok.22web.org/android_room_tutorial_kotlin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sodexodape.rf.gd/43085254141.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_off0001991b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1991B 5636 bytes
SHA-256: 1b63228b9f21597c12ce73243d48d4f047fec8d777a7f2428caf007918b2be0f
font_01_sfnt_off0001ac41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC41 11984 bytes
SHA-256: c781514eea088d01322ff1a95a0feec7df521c5a6690041743000e77e64b74bc

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