Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb1d46f15b879cac…

MALICIOUS

PDF

90.6 KB Created: 2021-03-21 09:15:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 54e00c634bb33545110255e7b662fad1 SHA-1: 797a8d93f5601538a34644509b860bb1394cb4b8 SHA-256: fb1d46f15b879cac278b43a64ef0f45deaad0679cdce11bb97482bf6c2e04aa7
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 of which point to disposable domains and appear to be part of a link farm for SEO purposes. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://xajibur.ru/wix?keyword=computer+lab+rules+video PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4495034/normal_60003b8b3b019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385020/normal_601cdb5e7954d.pdfIn PDF document text
    • http://jusojixanona.getenjoyment.net/analytical_and_logical_reasoning_questions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472221/normal_5fe64a93e4f2a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/54864167224.pdfIn PDF document text
    • https://ac4cd5cf-e861-4b1b-a585-e47049f737a6.filesusr.com/ugd/843280_a67d880036874a95beb4063e630ff9b9.pdf?index=trueIn PDF document text
    • http://jisunopesaluzi.atwebpages.com/nibavamemaji.pdfIn PDF document text
    • https://e5eb5b25-b33c-43e3-82d5-57ab1bf863d8.filesusr.com/ugd/b0c717_e6a9cf70ca6d4dcfb3ac768b6a9b333c.pdf?index=trueIn PDF document text
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_480119ab06694a7081b7c09dc8132973.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vutame/graphic_design_jobs_salary_malaysia.pdfIn PDF document text
    • https://bdee3e82-1fe6-4084-b289-f15f5249f83e.filesusr.com/ugd/749937_c9386b569fa84e6aa4a3854bea3fb828.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/litunux/kowewubinibitibu.pdfIn PDF document text
    • http://vajapojaperusu.myartsonline.com/92617089951.pdfIn PDF document text
    • https://f9fc249e-2e6a-4908-9eb0-88005465a50d.filesusr.com/ugd/2530ee_167b77bd798b41c6a6e355e9a0d09ff4.pdf?index=trueIn PDF document text
    • https://f1cb2ec4-a82d-4768-8a06-5236a2db220e.filesusr.com/ugd/a2e20a_0238c5ae0701403aa13751a7b1348fbc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fec72e66-51ca-4704-b5cd-b7c21c788641/rokozazifavejof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7adbe359-ef8f-48c8-a21c-1ae39dd9ebfa/71198341777.pdfIn PDF document text
    • https://f8b2de7a-6012-4721-b8f1-df5267d6bb95.filesusr.com/ugd/8ebb60_2400ee3ae55b43cb83d7ee6df58e8133.pdf?index=trueIn PDF document text
    • https://327bbe42-9aa5-4ca0-80e5-6c9857058a26.filesusr.com/ugd/2b870b_a37598866f034188b6fe9fd9b0952726.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/372e3bd5-8810-4f97-936d-014577c1e4fb/7591561082.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/crash_course_us_history_episode_5_answers.pdfIn PDF document text
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_0fc2ba0164764f7e8835590106989fd2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9b16218-892a-46c4-a032-49353c98f683/18006977585.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/9139509024.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11111 5212 bytes
SHA-256: 820ede0c1ee652c7d8c8a9d7b463c4f1266f803984f6ccdcd089db41db3d98ff
font_01_sfnt_off000122a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A4 10920 bytes
SHA-256: 695bc6073edf756e5984b88d344e1f935ddd1ea41add5cd1c66a0fed888edcb2
font_02_sfnt_off0001480c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1480C 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953

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