Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ee2fbc3b2775eec…

MALICIOUS

PDF

74.9 KB Created: 2021-04-26 03:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f2d6c9b7badb1e42eb00560c735086a1 SHA-1: cfe6246cb03df549473540ca686f8d28cf7b438a SHA-256: 2ee2fbc3b2775eec09a356f18a709e7796bc3727e0a8038daec25ba61ef80b75
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting or domains associated with SEO link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/strik?utm_term=how+to+find+cylinder+head+volume PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4480893/normal_5fcbac163263f.pdfIn PDF document text
    • http://nuwiratuzitezep.22web.org/boost_library_c_tutorial.pdfIn PDF document text
    • http://leziwazedo.mypressonline.com/audiolibro_caballo_de_troya_1_voz_humana.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422884/normal_601f1ae26fac3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460690/normal_6000c0563c61a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418984/normal_603455e893ac9.pdfIn PDF document text
    • http://molosorew.iblogger.org/biology_class_11_important_questions.pdfIn PDF document text
    • http://dadivasim.sportsontheweb.net/16642414066.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://05f6fcc2-a4c7-4d5b-b58c-97b640a93f4d.filesusr.com/ugd/74147a_12a314eb514f45e684f494c884fc31a3.pdf?index=trueIn PDF document text
    • https://c8019651-2137-4367-b38e-775fff3f8a75.filesusr.com/ugd/fc5a02_5aa075d5f549470b93b32d88cf10ce69.pdf?index=trueIn PDF document text
    • https://2791e1c6-719d-47aa-bdc5-1556df251b63.filesusr.com/ugd/7757c5_8d363a4b23524b0ca0ac7e3d6ba781e7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pidufozu/pesolasivuja.pdfIn PDF document text
    • https://5862e4ea-63a6-4c92-af93-e06d02d1a664.filesusr.com/ugd/eaa371_a0d5cc9add3b4577a143b4ddc89f031b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/zodojavepasokemeja.pdfIn PDF document text
    • https://9eb5ee95-128e-4115-bcd6-d8db8525ce49.filesusr.com/ugd/9904c2_1a66c15ae93c4b479b49b83b1eff6fef.pdf?index=trueIn PDF document text
    • http://sowinoto.epizy.com/50303947386.pdfIn PDF document text
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_2e356a71623a45b0aa91a42cd2f25624.pdf?index=trueIn PDF document text
    • http://jatuxijor.epizy.com/bopagebirifojamawuwuzaxe.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/78047077724.pdfIn PDF document text
    • http://punotonaduwize.atwebpages.com/the_largesse_of_the_sea_maiden.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_off0000e800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE800 5296 bytes
SHA-256: b7c22803d4973fbcb0b798b50bb95ff15c4e5ba931925b20011dc552bfe45f31
font_01_sfnt_off0000f9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F7 10728 bytes
SHA-256: b099ebd49080af58c2b9be5a69b5a1e101b9e72069ed6281ac04bcf9c4a818a1

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