Malicious PDF — malware analysis report

Static analysis result for SHA-256 68c4edead88ad9ea…

MALICIOUS

PDF

66.1 KB Created: 2020-12-16 23:06:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a8be9c9e6780d4a3f22324708dd9c4d6 SHA-1: 82a537cb9a8de206c2b9f06dc33e0404b197721c SHA-256: 68c4edead88ad9ea0feca4ef769098a1f991f61709cf0dddd7441a6e37c353b0
184 Risk Score

Malware Insights

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

The PDF contains embedded URLs that redirect to known malicious infrastructure, specifically identified as a redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though obfuscated, suggests a lure related to 'molar conversions worksheet answers', likely to trick users into clicking the malicious link.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?utm_term=molar+conversions+worksheet+answers In PDF document text
    • https://fufajogaxofamu.weebly.com/uploads/1/3/4/6/134627879/788620.pdfIn PDF document text
    • https://bekijarodik.weebly.com/uploads/1/3/4/6/134617997/litamagul.pdfIn PDF document text
    • https://dumejolizaxoko.weebly.com/uploads/1/3/0/8/130814858/kijunigemenegavil.pdfIn PDF document text
    • https://nuxirudeduw.weebly.com/uploads/1/3/4/4/134442083/jerelidexo-rigozute-mowobeku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413978/normal_5f97dcbfc9bc3.pdfIn PDF document text
    • https://momigetufi.weebly.com/uploads/1/3/4/8/134876151/9988507.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466173/normal_5fa9738194866.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387810/normal_5fc185c98e1ea.pdfIn PDF document text
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/padet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366961/normal_5f939020a6745.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/79872451101.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0ea6ac6229360ecad0c46/t/5fca9c9d7be84e581a9280fe/1607113885596/hungry_shark_world_hack_ios_12.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf512b4c4d833b8bcda1d/1606219029061/most_catholic_king.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
    • 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_off0000b2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D1 5108 bytes
SHA-256: 84b43f4c6fd82cc5a3e3de358ad1a6c75de7e8da142d43b6aa17c72c9dcf903e
font_01_sfnt_off0000c44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC44A 10004 bytes
SHA-256: 3291fc0bfefebe7aa03694511a6a1f78e53a88607539eac6cb388dd2c3576258
font_02_sfnt_off0000e675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE675 16132 bytes
SHA-256: 0845746d8e0f76c2c57e53a5d0c2d2ba36ed31c4724e2802406f297ba1795667

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