Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ad565dd5507fbc8…

MALICIOUS

PDF

74.2 KB Created: 2021-03-17 13:55:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8f953cbbe032b360d082d176c49387c6 SHA-1: 93d9f6e2a416d45ebb1a4856e53d522b9fc3a41f SHA-256: 1ad565dd5507fbc8073fc32a112cdfc87622cc8c15f355e698bce83caba91f98
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-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://leonvi.ru/strik?utm_term=who+makes+igloo+coolers PDF link annotation
    • http://bomisedoxu.mywebcommunity.org/95666923003.pdfIn PDF document text
    • http://sowopezamiw.medianewsonline.com/levitodati.pdfIn PDF document text
    • https://tebixuku.weebly.com/uploads/1/3/4/5/134595315/b9406506af704c6.pdfIn PDF document text
    • https://bewizujire.weebly.com/uploads/1/3/2/3/132303264/bavilemo.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/toguvaju/bronchogenic_carcinoma_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bde2e77-455e-48ac-8060-50f7b2fbf55d/1_pulgada_a_cm2.pdfIn PDF document text
    • https://1527c8d3-3321-4e9f-872f-e2bebb57bac2.filesusr.com/ugd/bf2d42_755d5920a04a477eb86e0930ad3c1468.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/08ff2089-e821-4acf-ad99-01e8f23cdce7/how_to_make_a_boy_fall_for_you_online.pdfIn PDF document text
    • http://jasunusemoki.onlinewebshop.net/map_of_asia_quiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f09bf9e8-a822-4341-9494-e2c52fc04fcd/gejovetufabar.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/casio_baby_g_shock_resist_manual.pdfIn PDF document text
    • https://92e0cadd-ca3c-497d-ba7d-1aece6ee6da0.filesusr.com/ugd/008e52_6913812e521044d7b66d3a26d410614e.pdf?index=trueIn PDF document text
    • https://711920be-b761-4f0e-a604-762b26663b16.filesusr.com/ugd/ffcbea_44f3f5b8e93f4ef1b209e3e9c86dada2.pdf?index=trueIn PDF document text
    • https://d5f1d3db-1598-48d0-a061-764c190a6564.filesusr.com/ugd/866690_abac102de8ad4c6c91185fd7d8acb97f.pdf?index=trueIn PDF document text
    • http://kuzemepusiloj.onlinewebshop.net/befomosijenip.pdfIn PDF document text
    • https://s3.amazonaws.com/lawakux/21103638094.pdfIn PDF document text
    • https://84bd2c60-91d0-47b6-9565-6ae8a6593e58.filesusr.com/ugd/963627_214a98b5d2c44447a181cbafd4aa9fae.pdf?index=trueIn PDF document text
    • http://zudupaxub.myartsonline.com/fasinejututanuduko.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/58290589333.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_off0000e246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE246 5288 bytes
SHA-256: ce418f35486fc8cd12f2ac6ebbda4b7f3ca95cc2f331fc6f61b92ce2e1faefd7
font_01_sfnt_off0000f425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF425 11596 bytes
SHA-256: 60b28fa91c2db79af5fd03d2b94a52878e28eb1d5f907a5bcd6bc355b60a7590

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