Malicious PDF — malware analysis report

Static analysis result for SHA-256 4278d8e6f1cecb2b…

MALICIOUS

PDF

76.2 KB Created: 2021-05-30 01:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 83f2f39c2af839405c0089cd836abc16 SHA-1: b1535d2d605420a870053d9c0cb3ceb13208efd6 SHA-256: 4278d8e6f1cecb2bba7414654a0568ca21e6376f3045605c1820f867f718d5c2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains references to 'constitution' and 'wkhtmltopdf', indicating a potential lure to disguise the malicious intent of directing users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://crophysi.ru/strik?utm_term=difference+between+1956+and+1973+constitution PDF link annotation
    • https://povixifanob.weebly.com/uploads/1/3/7/5/137517449/5471871.pdfIn PDF document text
    • https://vowodilob.weebly.com/uploads/1/3/4/6/134697463/bavoge.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391331/normal_60061fa918aa8.pdfIn PDF document text
    • https://lewofadexireg.weebly.com/uploads/1/3/4/8/134868993/9687540.pdfIn PDF document text
    • https://xereritotof.weebly.com/uploads/1/3/1/0/131070340/5435415.pdfIn PDF document text
    • https://xixezowipena.weebly.com/uploads/1/3/5/3/135341666/sekerewidaxorag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475570/normal_603febf761b34.pdfIn PDF document text
    • https://jaligudupu.weebly.com/uploads/1/3/5/3/135391073/rimajamarokekut-gagimusiku-tidadewupir-gufuz.pdfIn PDF document text
    • https://mobinefoju.weebly.com/uploads/1/3/1/3/131398425/8552239.pdfIn PDF document text
    • https://bupefozatige.weebly.com/uploads/1/3/4/3/134384552/4602798.pdfIn PDF document text
    • https://dekodisiga.weebly.com/uploads/1/3/6/0/136051758/6998095.pdfIn PDF document text
    • https://puroporutenes.weebly.com/uploads/1/3/1/6/131606954/7381960.pdfIn PDF document text
    • https://wasoxojeroxinab.weebly.com/uploads/1/3/4/8/134888233/3379178.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465908/normal_5fd0e473528b9.pdfIn PDF document text
    • https://vidokabotofasi.weebly.com/uploads/1/3/4/8/134868814/vezovoziwilul.pdfIn PDF document text
    • https://wajajudamivigo.weebly.com/uploads/1/3/4/3/134359543/420818d5a54.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/211fec4b-7fda-417b-b1fd-9bfa06497553/lg_v20_android_9_rom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/755fd643-5107-4e13-8153-910ada481e4d/black_and_decker_gtc1843l_18v_cordless_long_articulating_hedge_trimmer_430mm.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_off0000eb6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6A 5944 bytes
SHA-256: 0bd7e210dc1fabdeaa38c17c1b8d49d1369516feaab24845a04005ea33d00fd1
font_01_sfnt_off0000ffcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCF 10552 bytes
SHA-256: 4fc21fc45565fc99893e57989f94047c97c836e2b8da16cde6660f1cce48dd02

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