Malicious PDF — malware analysis report

Static analysis result for SHA-256 19de191c3d2e4301…

MALICIOUS

PDF

116.8 KB Created: 2020-11-25 00:04:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 2048999e8a3049fbcbdbaef0108171de SHA-1: 10aee90365909d50d747e030179ccfc4fe1942ba SHA-256: 19de191c3d2e4301a0312d9b55e9631a7aebd1c9aeccb270b9e628475e6a6984
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafffi.ru/123?utm_term=high+school+musical+2+pdf PDF link annotation
    • https://zekuwatifakaxi.weebly.com/uploads/1/3/2/8/132815855/gebamiguloz.pdfIn PDF document text
    • https://weniwekozeg.weebly.com/uploads/1/3/4/0/134012595/larofaferavowudirow.pdfIn PDF document text
    • https://dojudiwoju.weebly.com/uploads/1/3/1/4/131406456/wakim_kimef_gilozinanemi.pdfIn PDF document text
    • https://revibafejinaj.weebly.com/uploads/1/3/4/4/134485322/mekak-petavuluwe.pdfIn PDF document text
    • https://waziketezu.weebly.com/uploads/1/3/4/6/134648841/pejatejemupi.pdfIn PDF document text
    • https://gazulaloruvuv.weebly.com/uploads/1/3/4/6/134693071/aa60d.pdfIn PDF document text
    • https://pajopujo.weebly.com/uploads/1/3/4/3/134305169/gujaxixo_pazuw_nozikovoriz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/ffa250e9-edb9-42cc-9e61-eb6654e18c9d/pewajamo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5b089d4-e0b9-450b-bc5a-a4048211923e/starbucks_receipts_for_points.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/touhou_6_download_moriya_shrine.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/lowifivitemurebisamove.pdfIn PDF document text
    • https://s3.amazonaws.com/vasofirida/generic_architecture_of_semantic_web_application.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44908b4b-7bfa-464b-a868-05018f95c9fd/mizituxoruwizizura.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001801a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1801A 5144 bytes
SHA-256: 535e316c4b523fcbbf3fb5b6007aa4837445a6a7952cabd190f9e9541858f4b9
font_01_sfnt_off0001919f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1919F 11296 bytes
SHA-256: 116e6dea59f96d39292345261ca52517a7c5003f1faa58d51de4bfd9cbe9b569
font_02_sfnt_off0001b808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B808 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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