Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5b4ece330fd5914…

MALICIOUS

PDF

76.7 KB Created: 2021-04-09 02:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 38cc65e84820c53e050f65bf812bcd8b SHA-1: b0ec23396d32f9b7945135fd6535d608efce3b3f SHA-256: c5b4ece330fd59146562434179d47666bbe1226877c2bc2d5f61563f437445fd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, appears to be a lure related to 'love languages', directing users to a URL that includes a 'strik' parameter, suggesting a phishing or malicious redirection attempt. No scripts were extracted, but the overall structure and URL distribution indicate a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/strik?utm_term=what+types+of+love+languages+are+there PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4486359/normal_5fcef6647adec.pdfIn PDF document text
    • http://lnstagram-copyright-supports.com/55398846205oypih.pdfIn PDF document text
    • http://swiss-family.space/693833173687mneg.pdfIn PDF document text
    • http://milansit.space/nightside_of_eden_lyricsnfkul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470678/normal_6032c28533eb6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469630/normal_5fc86b08c2e14.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401545/normal_600158ade0eb5.pdfIn PDF document text
    • http://by-roof.ru/1490541106084pjk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372985/normal_6021ab903e804.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459165/normal_605c9c3fae775.pdfIn PDF document text
    • http://lg-supportteam.com/binelupb012e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446494/normal_6021d4f00957c.pdfIn PDF document text
    • http://lady-bug.club/6420952197n5b7c.pdfIn PDF document text
    • http://morpeoplelife.ru/what_is_0.01_significance_levelsmwa3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_9f6d1a3036454fe49e6da9bf730386b3.pdf?index=trueIn PDF document text
    • https://37e79482-e567-4eff-b449-6ea9b90d4679.filesusr.com/ugd/cff0cd_7e7167c80be2416d82ff241d62d0713a.pdf?index=trueIn PDF document text
    • https://32cf4326-ba62-484c-a3ca-05d02c2dd2e5.filesusr.com/ugd/0b46e6_65c1f022e2c64577be4407d8eef215da.pdf?index=trueIn PDF document text
    • https://5926284e-b61c-4ed0-95e5-27b9feedd2c3.filesusr.com/ugd/50c35f_1f736bac70004d6ba4032d531daed810.pdf?index=trueIn PDF document text
    • https://504706c9-3a86-45eb-876a-6494ef133fff.filesusr.com/ugd/80c1db_5697d737412c44f0902a6700430cc66b.pdf?index=trueIn PDF document text
    • https://d4f1f58f-bd44-402a-a4b0-a3aa01e36dbf.filesusr.com/ugd/dffefa_9ca4eeabd72f45efbf54825fa5907b32.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC24 5340 bytes
SHA-256: a5a818c56bade2593d075ef87f367e41b478b6d20e50c78a9eefac40f58333f9
font_01_sfnt_off0000fe69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE69 11724 bytes
SHA-256: a85e0c2fb3d8afb20be8a1197933b55c5e7a5a0474cb58105c44e96e205a3210

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