Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b1318077226aa1…

MALICIOUS

PDF

75.7 KB Created: 2021-05-17 12:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 5bbc76de7d10ab41c6d77e0dbe6fd9de SHA-1: 40f99e84f074300b0e82bedf1552f2d4d5977a0f SHA-256: d5b1318077226aa194aae4e53b2a6cdae3ee8199dc1f643e0177df7a83de0d36
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, suggests a lure related to a book title, which is then used to disguise malicious links.

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://dafemum.ru/strik?utm_term=communication+skills+for+the+healthcare+professional+3rd+edition In PDF document text
    • https://rubexanow.weebly.com/uploads/1/3/5/3/135346757/tajafok.pdfIn PDF document text
    • http://help-copyrightservice.xyz/is_jotaro_in_part_7xmw0j.pdfIn PDF document text
    • http://edalovert.xyz/zovanatudov8cjh0.pdfIn PDF document text
    • http://becloud.website/zakuxewiwikudaditedolimwifck.pdfIn PDF document text
    • http://sdl-trade.com/dnd_5e_new_barbarian_subclass6lutx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403672/normal_6029455694c19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411682/normal_606a7e15c3663.pdfIn PDF document text
    • https://rorezumi.weebly.com/uploads/1/3/4/5/134591247/linedimesar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385012/normal_604b8188da9ce.pdfIn PDF document text
    • http://magicwoolshop.com/77129990240r2tj0.pdfIn PDF document text
    • http://cleaner-inn.club/xikidesituz0xdd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390684/normal_60002aa701532.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423428/normal_605e13a6137d9.pdfIn PDF document text
    • http://wwwbcpzonasegura-viabcp.com/60906104268cov7m.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/30cff388-cda3-4709-aaea-eece91be0ad9/91917122090.pdfIn PDF document text
    • https://36fde204-cda4-4268-899b-58717f9005d0.filesusr.com/ugd/b13063_74ec2eb268634f88962a82d947f7ea4a.pdf?index=trueIn PDF document text
    • https://8ab8d0a6-ebcf-4503-ac90-3c5d9a0926ce.filesusr.com/ugd/8585d4_13ab099eafa3467490908a1e5fa4d10f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/62b77500-7a66-4b1d-8e6f-ac73af682c89/pozigegofeziro.pdfIn PDF document text
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_1226a6e9dde04cb78fcaedfbd40be74d.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_off0000ea0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0D 5528 bytes
SHA-256: 06fd0b3692dadd86e18199aafbece4d685208e1f33a13c8e173a2e49b21b8ab8
font_01_sfnt_off0000fcad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAD 10584 bytes
SHA-256: b8d655eff9a059cb65e55b6695a3d96875aabd7a12546bfccf14ad002f24506e

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