Malicious PDF — malware analysis report

Static analysis result for SHA-256 69187dfe078d2eac…

MALICIOUS

PDF

74.6 KB Created: 2021-04-03 16:56:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 3ca6941953694c65ab4adb1b17d41ce4 SHA-1: 4b62cd3a99c94afb2f3e78ab1435eee204dd7630 SHA-256: 69187dfe078d2eaced3eafc04c8057c73753324563017cf87862e0f389d6a2ac
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains keywords related to educational content, likely serving as a lure to direct users to malicious websites.

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
  • 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/wix?keyword=elastic+potential+energy+lab+answers PDF link annotation
    • http://good-production17.site/17232705378p3ysn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401712/normal_5fe95f2fc862c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449600/normal_5fe9dda676750.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383565/normal_605a54cb97c2e.pdfIn PDF document text
    • http://laitlabs.pro/tofamowile3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380072/normal_6021d21e4ccc3.pdfIn PDF document text
    • http://mosquito.codes/16091915850jg1il.pdfIn PDF document text
    • https://cdn.sqhk.co/xeloxilava/fbChbUd/35495547344.pdfIn PDF document text
    • http://nyvelsets.online/biharwap_in_video_songb0ckj.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404490/normal_60316222a1d85.pdfIn PDF document text
    • https://vinetiwufo.weebly.com/uploads/1/3/5/3/135305890/jifexefosi.pdfIn PDF document text
    • https://tavugalijob.weebly.com/uploads/1/3/1/1/131164394/wavozup_naxafekunod_tegozanususivom_fudukig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383451/normal_60079ca57f2be.pdfIn PDF document text
    • https://cdn.sqhk.co/buruvalufe/a719Kgj/gimowotufiriwijubej.pdfIn PDF document text
    • https://zekaxuwamawebi.weebly.com/uploads/1/3/5/9/135961115/f6fc215c.pdfIn PDF document text
    • https://cdn.sqhk.co/muxaferamet/2yE8StG/31770425546.pdfIn PDF document text
    • http://vuvuga.xyz/gibebatexixizadavoziiu3v0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE601 5392 bytes
SHA-256: 86359ab21ecc6c75e67a839afb17dab3a3805cfecd90b1bd9c6179a14d4cffb4
font_01_sfnt_off0000f87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87C 10740 bytes
SHA-256: 91b13ea8d650a5829814db2735228667752f0ac86ea90cee32ac1d595bd950c8

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