Malicious PDF — malware analysis report

Static analysis result for SHA-256 f40dff32eb5c55e3…

MALICIOUS

PDF

106.1 KB Created: 2021-04-15 09:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 58c79211278d10a96f1b2a327f54f6b4 SHA-1: e417ee3965dddbb870b3780e9a49317b2cec9870 SHA-256: f40dff32eb5c55e3479cf3f6df20112611161d605634dc3f5c56ade6e5528ab8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to a book summary, aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://soxebez.ru/strik?utm_term=guns+germs+and+steel+chapter+19+summary PDF link annotation
    • http://powajaxib.medianewsonline.com/spoken_english_book_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392873/normal_5fe2f07210f1e.pdfIn PDF document text
    • https://pavonaxasove.weebly.com/uploads/1/3/5/3/135310158/xiwulodax.pdfIn PDF document text
    • https://rofewonopanofav.weebly.com/uploads/1/3/5/3/135312507/roxukomuwakit_nilolunixeka_menuditovi.pdfIn PDF document text
    • http://jonebukusopovet.mygamesonline.org/33485567533.pdfIn PDF document text
    • https://jetefodakulerur.weebly.com/uploads/1/3/1/4/131453332/2578064.pdfIn PDF document text
    • http://mopexaxurip.getenjoyment.net/55002187944.pdfIn PDF document text
    • http://xuxikanewojolaj.22web.org/gibuzirugopivoretiliser.pdfIn PDF document text
    • http://bimovixexena.scienceontheweb.net/english_orthography_rules.pdfIn PDF document text
    • https://notefusiwedamap.weebly.com/uploads/1/3/4/8/134872173/paribegusaxoduk_tixuro.pdfIn PDF document text
    • http://gepanukotex.getenjoyment.net/gordon_leishman_helicopter_aerodynamics.pdfIn PDF document text
    • http://vizazovabula.mywebcommunity.org/mechanical_engineering_course_cost.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378619/normal_6052ad5d361ef.pdfIn PDF document text
    • https://nironaguvotu.weebly.com/uploads/1/3/4/5/134530025/4ac18.pdfIn PDF document text
    • http://xiguxivevov.sportsontheweb.net/basic_knowledge_of_computer_download_in_english.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/16f6b020-8989-4156-9583-f22e6c7d1e03/ideas_para_decorar_corona_de_adviento.pdfIn PDF document text
    • http://luvigewe.rf.gd/25940142607.pdfIn PDF document text
    • http://zukegavodobuxas.epizy.com/marvin_harris_el_materialismo_cultural.pdfIn PDF document text
    • http://zegetafirotazaz.atwebpages.com/vision_april_2020_current_affairs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7103bd4a-13ca-4167-b8da-b59fcb1a35b3/25769563345.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08e7b052-70af-4921-94ca-8737e497744e/26478901766.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/295be4e9-1bdf-4766-ad2b-783c70afba9e/fibololonurafi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000160b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160B3 5828 bytes
SHA-256: eafbf904ff7030395fb0f0896c8c1710a8dd274d0ab7152cd0e1ca8da8b25f2a
font_01_sfnt_off0001746f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1746F 11444 bytes
SHA-256: 5a18b89117f30a621392647f71a3b94e07ba98773f651b07913ee2b2f17f0716

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