Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b2293e1f64536a…

MALICIOUS

PDF

77.2 KB Created: 2021-06-07 06:40:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4e92ae203f06e64f901f7ec70206036a SHA-1: 1f14dcc1f525918e50601d599a45587570be0454 SHA-256: d5b2293e1f64536a7566df1432f39a6e25e1ceabc90a259697b5740d944891dc
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users to potentially harmful websites. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan. While no scripts were explicitly extracted, the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://dugedepap.ru/123?utm_term=bootstrap+form+design+online PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465402/normal_604d2d032b50b.pdfIn PDF document text
    • https://majujeleku.weebly.com/uploads/1/3/4/5/134590665/nasofefilu_pitomeser_ravusinelukam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405186/normal_60263a6f02799.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417534/normal_60200478656f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409393/normal_5fd8246c8917e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417530/normal_60b9a5264448d.pdfIn PDF document text
    • https://vorevowupi.weebly.com/uploads/1/3/4/6/134633589/2167560.pdfIn PDF document text
    • https://ziwirekow.weebly.com/uploads/1/3/4/5/134529616/3917551.pdfIn PDF document text
    • https://wofefewivesupas.weebly.com/uploads/1/3/5/9/135957376/xodafomufeniwobaju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468296/normal_6069f1ffaf0e4.pdfIn PDF document text
    • https://motodamoz.weebly.com/uploads/1/3/1/4/131452818/tuwagasojiwelox.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/2546cce5-c6ee-46f9-bfd0-45df3d2408a9/fender_frontman_15g_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d9beec7-4708-46ea-92a7-16ee71b4739d/83148172075.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03c79352-ecfa-4ff2-9591-29c65bd52751/fisher_and_paykel_fridge_spare_parts_melbourne.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cca1fcd-6195-4742-b6b3-f7c0f5b39034/how_to_become_an_emergency_foster_parent_for_infants.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcdf15f9-1976-4432-a236-04de0b57faca/81134729595.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d909bf7-af61-4c92-a982-3298077b8d33/14754775967.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_off0000e561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE561 5196 bytes
SHA-256: b7cf8d85f95b04e5a971a69b33517afd9c4b16c692d9317b8134367a8db502de
font_01_sfnt_off0000f6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F4 10196 bytes
SHA-256: 234d4a1668282ed6c1b3bd14893e984ebe599feaa438a1829af6d84baf48650a
font_02_sfnt_off000119db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DB 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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