Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f5f4052cb1927f7…

MALICIOUS

PDF

76.1 KB Created: 2021-05-10 02:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: aad738aa867594a78e5c06bdec320943 SHA-1: 008258e76f6e7350f2c10c9b2af231df362740f9 SHA-256: 0f5f4052cb1927f7a2d64edf721f0889ca88b9aff7ad6d11da839940dfe9d7bf
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dafemum.ru/strik?utm_term=big+java+late+objects+2nd+edition+pdf+download PDF link annotation
    • http://rutefozur.22web.org/fifewiko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://235a1a37-2bc9-4d3b-8f1d-d3952ad9fba8.filesusr.com/ugd/3111f7_916cef3616084fbeb24cdfc1b283a638.pdf?index=trueIn PDF document text
    • https://058da8ce-bb30-4b8c-81eb-8903018cac65.filesusr.com/ugd/ab745b_275335950c584f57b23432f668ac2a1b.pdf?index=trueIn PDF document text
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_67828f868ae34101a28460bb5a8e5969.pdf?index=trueIn PDF document text
    • http://fozufafetad.epizy.com/47946295644.pdfIn PDF document text
    • https://9f4ad419-87ad-4507-9b23-40b7c7395cc9.filesusr.com/ugd/55478e_ec17675f4709423aa4abc3b6249f6ea1.pdf?index=trueIn PDF document text
    • http://derijumofode.rf.gd/fesigamijidometokidif.pdfIn PDF document text
    • https://933afb0c-60ca-4ff4-ba38-e7c804ca925d.filesusr.com/ugd/941881_51fd102f89494724b8edfb62267e2547.pdf?index=trueIn PDF document text
    • http://lodavudomajip.epizy.com/woxuweda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c0033d1-d1ad-4e1e-8e76-2cd3b2636142/nogenibifo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4522aceb-5ba0-422a-8331-a7b350ed7f8a/tomanifolur.pdfIn PDF document text
    • http://tamedigozetot.epizy.com/why_wont_my_garmin_update.pdfIn PDF document text
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_4adf26f2c5914ddda3b70e9f9b4c54a3.pdf?index=trueIn PDF document text
    • https://e86c6366-0652-46cb-9e1f-5633a133dba9.filesusr.com/ugd/510a18_9e051102637440fa832d6f68cfd758b9.pdf?index=trueIn PDF document text
    • http://mobejegi.epizy.com/understanding_and_using_english_grammar_4th_workbook.pdfIn PDF document text
    • https://0dc5fd1c-b354-4e5b-9ccd-45395e8994ed.filesusr.com/ugd/f79e8d_73f8a5e18fc04fb69952e797fcc11aec.pdf?index=trueIn PDF document text
    • https://40fd9d30-e691-4ad4-9ff9-7de67b304886.filesusr.com/ugd/45b27a_f7fbb1fce9f94cce8f4271c757c70412.pdf?index=trueIn PDF document text
    • http://biwomilorawud.rf.gd/wesojosakugezadixovotoze.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_off0000e8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DB 5776 bytes
SHA-256: 9b9e30c46a1d33e718c404b1633328003c7a6e26c7c9180bd1bb20bdaba94b91
font_01_sfnt_off0000fcb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB8 10744 bytes
SHA-256: c8e14f0bcabf0a31ddf50ec8af15a715e3a31b3e078449f2f044dfeb8b50975c

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