Malicious PDF — malware analysis report

Static analysis result for SHA-256 aec9b82b8e6cfb9e…

MALICIOUS

PDF

79.8 KB Created: 2021-03-12 01:43:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 80690ed618523f5b78bbb6e9234877b7 SHA-1: 130657ed3c721007908c6d6d6c6b9eee7f4f47d5 SHA-256: aec9b82b8e6cfb9eb531f538af73a6d434a65743bb03fb4e6103c34f3e6acb4e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://xajibur.ru/wix?keyword=online+manual+ps3 PDF link annotation
    • http://trychambre.xyz/162636173512mfdb.pdfIn PDF document text
    • http://karaulovlife.site/74271835419bkb55.pdfIn PDF document text
    • http://vitrinachel.ru/madixeu9exq.pdfIn PDF document text
    • http://cocobuka3.xyz/62690673340vx34q.pdfIn PDF document text
    • http://volosaty100.xyz/zuwepejudodoluruwny.pdfIn PDF document text
    • http://chisto-chisto52.ru/rudetilakozajv1pf4.pdfIn PDF document text
    • http://asta-stroy.ru/18540681865mj5rl.pdfIn PDF document text
    • http://cashfree.store/modals_for_permission_obligation_and_prohibition_pptn9pzy.pdfIn PDF document text
    • http://tabikola.online/decision_tree_examples_in_r9kuda.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/7b9cc652-d3fc-425e-a1fe-a1938809d72e/93008755138.pdfIn PDF document text
    • https://b3dfd9c9-1030-471f-a26d-814ea73dbccc.filesusr.com/ugd/d97afa_5bbdfc66ba32421688ccae0fb742a1eb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8273908-207d-4b3f-9ae8-903de518d3d4/94284548753.pdfIn PDF document text
    • https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_3672233cb27747aca807bd44d47ef6a5.pdf?index=trueIn PDF document text
    • https://f200304d-316b-45a9-b05c-680123ec6d1a.filesusr.com/ugd/aad1a2_446cec6d7a784b78a6c48748e7194093.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tobito/6745508800.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/57687157692.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b61b1f33-e187-40c1-904b-9d99c0dd002c/36953693082.pdfIn PDF document text
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_77342f4554e7404bb74719c8a19713d6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e49e900-4975-4628-8a8d-aa26f9ddf88d/rumogaxizer.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_off0000e5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CE 5060 bytes
SHA-256: d451c10d9d4cb60cd700a39342bf5ebdb79295a670df3826df3f4590fbae21d0
font_01_sfnt_off0000f6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EC 11328 bytes
SHA-256: 8df6d2cce58f9ed8f57e055465f52aedd737655104180d29abc67a3788a087a8
font_02_sfnt_off00011cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAC 16232 bytes
SHA-256: cb0239a5e77cb37740da0b4997a5f47117ed526887f952b298c44ef8b2f17e18

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