Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d6b86e3b06e6f23…

MALICIOUS

PDF

113.6 KB Created: 2021-06-04 06:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 8a290e3ff1cec380b9323599bf201eec SHA-1: ab833aec71a5e5d4bc81af833055173169756581 SHA-256: 9d6b86e3b06e6f236d57b274ce0909ee7faae38dfd500ec2a35cf91a23a58d04
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable hosting services like Weebly, suggesting a link farm or SEO abuse. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of numerous external links, including one with a UTM term, points towards a tactic to drive traffic or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jottigo.ru/123?utm_term=arabic+mehndi+design+hd+images PDF link annotation
    • https://bazitakitavame.weebly.com/uploads/1/3/5/3/135394276/merefozetukiker.pdfIn PDF document text
    • https://sinofokum.weebly.com/uploads/1/3/5/3/135316266/vejululapezazonemok.pdfIn PDF document text
    • https://galovuxo.weebly.com/uploads/1/3/4/7/134760431/031da81f854.pdfIn PDF document text
    • https://zaruteso.weebly.com/uploads/1/3/4/7/134716260/cc4f0ea4.pdfIn PDF document text
    • https://mukojemugasab.weebly.com/uploads/1/3/5/3/135314074/zidobasobijij-panuloperuzulil.pdfIn PDF document text
    • https://givodopularolot.weebly.com/uploads/1/3/7/5/137508410/2ca5fa5293a8a.pdfIn PDF document text
    • https://gipoxafevipetim.weebly.com/uploads/1/3/1/3/131398102/a41559555dc630.pdfIn PDF document text
    • https://lawanirixuxevu.weebly.com/uploads/1/3/4/4/134444287/fejebuse.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425723/normal_5fce796a2f0e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413712/normal_5fed46c57f770.pdfIn PDF document text
    • https://wokukowuvewa.weebly.com/uploads/1/3/4/3/134316041/pufogak_dadiduputig_rivada_vukusiwem.pdfIn PDF document text
    • https://kulisofupelami.weebly.com/uploads/1/3/4/3/134354285/jobodebok.pdfIn PDF document text
    • https://lusizemanu.weebly.com/uploads/1/3/4/1/134108609/7407280.pdfIn PDF document text
    • https://todatotosikuped.weebly.com/uploads/1/3/0/7/130740429/7002529.pdfIn PDF document text
    • https://rivelipa.weebly.com/uploads/1/3/5/3/135349188/881562420c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475570/normal_5fe93e7687c8d.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/6410bb49-37d1-4327-a1ba-5b3f6423bba0/libro_de_mitologa_griega_para_nios_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d45e30b6-8fe1-49fa-bd71-9d317635bdeb/gawujujalozasazojafofa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dedec1cb-c75d-47c0-a3c3-a340c83bce36/89096636914.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a013bc4-305e-44e8-aae3-3d69a912c1cc/98394287529.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8475ed36-b79c-488a-978b-4e7ccaf70f40/78465888274.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1cdd935-059e-44ce-8f47-5e372bf7d34c/guvasozoxogaso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b92968b-540f-4f77-950d-743ca0aa1b96/when_nietzsche_wept_movie_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fb9a9bb-6c4d-41d8-a405-9b74cad128c8/do_spark_plugs_need_to_be_gapped.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/806a851a-3af6-4492-b5d9-c43cf5b2cc47/gipitetonuzata.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_off00017e2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E2C 5448 bytes
SHA-256: 43ba87b9ce9a28ec9f5375add5d5e5786af17ce363c83c2b9bbca65abcd6cf67
font_01_sfnt_off00019088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19088 11164 bytes
SHA-256: 479ceab0e9d5606a28eeaef3a62f7c94e291f7ebf7cd3ea8b62521e78bcd7aa7

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