Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc93a63b806e6e1…

MALICIOUS

PDF

78.0 KB Created: 2021-04-07 01:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 4f7c9dc2505852d5b577e2d5d28dab41 SHA-1: cfc5533d84cab803384a871738ac0878a1f69714 SHA-256: cfc93a63b806e6e1bd5a4eeeebc5b9260c0308e0ebf37dae3d1472a525ec6f9d
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains an embedded URI pointing to 'nipisod.ru', which is likely a phishing or malware distribution domain. The document body appears to be malformed or obfuscated, preventing a clear understanding of its specific lure, but the presence of external links and the high-risk heuristics strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/award?keyword=ryden+aggression+scale+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485451/normal_606b93190df9e.pdfIn PDF document text
    • https://jerupixudenaxi.weebly.com/uploads/1/3/1/4/131437293/bedezevebujupifuxo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447880/normal_5ffb852a88eb8.pdfIn PDF document text
    • https://rofikilidoxomuk.weebly.com/uploads/1/3/4/0/134017179/847024.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446027/normal_5fda2de224b72.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417220/normal_5ff1c39617de6.pdfIn PDF document text
    • https://barijenevedi.weebly.com/uploads/1/3/1/4/131438420/zunesizane.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392867/normal_60146ade0fd17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425768/normal_60192db6d038c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476569/normal_5fe519881a2f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374859/normal_5fc59ca2db996.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450044/normal_5fce724eb34fa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://87098103-4d08-48bb-90a6-807b0ef734b2.filesusr.com/ugd/1f49de_68189c45fc39432caac6021ae998cfb1.pdf?index=trueIn PDF document text
    • http://keruxenuriwi.epizy.com/what_is_technicolor_cgm4140com.pdfIn PDF document text
    • http://sobemub.epizy.com/songs_of_innocence_and_experience.pdfIn PDF document text
    • http://nanojali.epizy.com/advertising_download.pdfIn PDF document text
    • http://buvukudoxug.rf.gd/bu_bhopal_exam_form.pdfIn PDF document text
    • http://tatasuvuputo.epizy.com/tegubolikipabew.pdfIn PDF document text
    • https://cc6d8859-fc08-4100-a073-55b48c5addfc.filesusr.com/ugd/238140_6149e8f377da4d0996680ac09e280b9b.pdf?index=trueIn PDF document text
    • https://98be45bc-63b9-4117-aff7-84a3d4f2c4a0.filesusr.com/ugd/90c678_f2f7ffb48bf748eebedf283f981d7c7c.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE90 5432 bytes
SHA-256: d3bffc227fc5d2e1f4f1ea6d53db8a848a631fb935677fe9b9a81efa95c6d079
font_01_sfnt_off0000f132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF132 10992 bytes
SHA-256: b3dbb40744ae480dfac27097e09d2709e27b27ba879d1055c03bce4bce900870
font_02_sfnt_off000115e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E3 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330

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