Malicious PDF — malware analysis report

Static analysis result for SHA-256 26e5e92cebd6377e…

MALICIOUS

PDF

103.0 KB Created: 2021-05-24 19:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e5140b2282068627880761cb7f8cbb69 SHA-1: 24e74406358dd624c524dbbbd75fd82d21f1a1ed SHA-256: 26e5e92cebd6377ef3640c3f54e013ed9b2afd03b82c3e143f307cf471f5ddcf
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, appears to be a lure related to a 'civil war worksheet answer key', aiming to trick users into clicking the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://fokemale.ru/strik?utm_term=the+story+of+us+civil+war+worksheet+answer+key PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4402481/normal_5fc9e9af54f68.pdfIn PDF document text
    • https://komutezux.weebly.com/uploads/1/3/1/3/131398036/de59c08.pdfIn PDF document text
    • https://nawiwunusuwo.weebly.com/uploads/1/3/2/7/132741181/fb52d0f.pdfIn PDF document text
    • https://sotufipepu.weebly.com/uploads/1/3/4/5/134595957/752304.pdfIn PDF document text
    • https://xalekosud.weebly.com/uploads/1/3/5/3/135350534/nikavarelejonedo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471703/normal_60467574639a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450428/normal_606ce13326f96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465705/normal_605d3eab5864d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382413/normal_60563cb1bf5aa.pdfIn PDF document text
    • https://melejorun.weebly.com/uploads/1/3/0/7/130775242/3654a655a.pdfIn PDF document text
    • https://goxejebifebiv.weebly.com/uploads/1/3/2/6/132682819/4909121.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/704e055c-ce16-4c33-b2ba-1993f0136b31/2012_highlander_hauling_capacity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61fc1514-4b81-4839-97d7-7e9711d8b25b/5464852195.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/schaum_series_vector_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/040eb8f3-5422-44d3-903e-c222855e8c18/what_are_the_12_human_body_systems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3338696-3c04-4971-9f43-b0905bbf93f0/74924153281.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e66f52b9-5426-4992-a300-d979f14f22a2/xunosuxupepasibejinalide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72f111ec-0c84-44c2-8606-782414204ebb/best_life_insurance_in_australia_review.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/what_was_the_purpose_of_the_dawes_act_of_1877.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe805413-9b41-46c8-bb70-d9b6244d6f51/getupuxenovuxikirej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9833372-a2f3-4e80-b77a-06181cba66db/why_is_my_vtech_cordless_phone_saying_no_line.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B47 5120 bytes
SHA-256: cd1545596fab66383aa9897a1161decf4c861953f6a3ea867b3a9fd19f0f8cc3
font_01_sfnt_off00015cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CC5 10476 bytes
SHA-256: c1a5e4e1bb7eb20e599fbf01f33307efb7b46f7e26b95ccea98dac1e072fee53
font_02_sfnt_off00018015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18015 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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