Malicious PDF — malware analysis report

Static analysis result for SHA-256 e454fa97eaef8496…

MALICIOUS

PDF

74.0 KB Created: 2021-02-18 01:14:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 803c777d5ce335aa3502f50d9a12014a SHA-1: a54ea5ac9e832cbd8523485729aac8be3fb95c96 SHA-256: e454fa97eaef8496114502008dc14fb61b120746d0f2e7a30df396dfec75a26f
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URLs likely lead to malicious content or phishing pages, aiming to deceive users into visiting them.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=my+cloud+home+review+2019 PDF link annotation
    • https://kikafizujugu.weebly.com/uploads/1/3/4/0/134012642/dewuxufilifitegegal.pdfIn PDF document text
    • https://varozuwibudod.weebly.com/uploads/1/3/4/3/134327914/69201.pdfIn PDF document text
    • https://depagolal.weebly.com/uploads/1/3/0/8/130813973/4703692.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392451/normal_602999bc5f2d3.pdfIn PDF document text
    • https://nerukime.weebly.com/uploads/1/3/1/3/131379394/rokefiwidojoxeb.pdfIn PDF document text
    • https://marizezibafive.weebly.com/uploads/1/3/4/8/134865590/4539672.pdfIn PDF document text
    • https://lilawowawumoxo.weebly.com/uploads/1/3/1/4/131453384/6280238.pdfIn PDF document text
    • http://fexevosekuzavep.iblogger.org/gerudo_valley_sheet_music_flute.pdfIn PDF document text
    • http://cozyplacefor.rest/relatomtey4.pdfIn PDF document text
    • https://pigofularujatuf.weebly.com/uploads/1/3/4/3/134360020/e40e43a7744995.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454973/normal_5fee81c300cd6.pdfIn PDF document text
    • https://xaweregosakub.weebly.com/uploads/1/3/1/4/131407668/6f6e038.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369487/normal_5feebff985860.pdfIn PDF document text
    • https://muxojuwarerufi.weebly.com/uploads/1/3/5/3/135388895/96250.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389106/normal_5fce2e6fd89da.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xenavak.rf.gd/wamufi.pdfIn PDF document text
    • http://lobulowigewimu.epizy.com/android_auto_not_working_honda_accord.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_off0000e492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE492 5532 bytes
SHA-256: aea069f164a7b3f591a58946ee237c4238baa0ef8389959fe1e9c52980285442
font_01_sfnt_off0000f764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF764 10464 bytes
SHA-256: dfd6f5cc5c6c9853f4b1b550f5ebdc55e6491e9026ebd7514c6a7bfefa2e3f8e

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