Malicious PDF — malware analysis report

Static analysis result for SHA-256 24ffde5d34b03ab5…

MALICIOUS

PDF

80.4 KB Created: 2021-03-27 10:05:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 1a5211391b059947dc00ce975e76dcf7 SHA-1: a7b38e8b2d7f42208e70719fbb8cc4c114d17b75 SHA-256: 24ffde5d34b03ab5fbb7769a4b1cc3f154b207c5ad1fe5ba28a55df4074e9b56
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a lure related to thermostat connectivity, directing users to a suspicious URL. The presence of multiple external URIs and a link farm heuristic indicates a phishing or malicious redirection attempt. ClamAV and ML classifiers confirm the malicious nature of the file, likely serving as a phishing document or a downloader for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://zajinet.ru/strik?utm_term=how+do+i+connect+my+lux+thermostat+to+wifi PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4419192/normal_5fcc4e31a33c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485440/normal_604032843dfd8.pdfIn PDF document text
    • http://lavkavkusa.store/konebominekoduzovebedapuab8g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448121/normal_601d1a23197ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383449/normal_5ff70abe43b8e.pdfIn PDF document text
    • https://cdn.sqhk.co/xomatujod/OigihLG/micro_warbird_rc_planes.pdfIn PDF document text
    • http://teachost.com/merrill_lynch_card_loginne1g0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409827/normal_604fb99c33107.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422148/normal_603602ebddcf0.pdfIn PDF document text
    • https://cdn.sqhk.co/nawiwola/fFgfhiy/lisixegudizogatexibajaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377928/normal_5fffaaff55487.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456143/normal_604cfb03bd7d7.pdfIn PDF document text
    • https://cdn.sqhk.co/konosoka/jjPjVY3/parentvue_fcps_whitman_college.pdfIn PDF document text
    • https://cdn.sqhk.co/totimujid/C8ijrji/best_credit_card_swipe_app_for_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/soxaxojuxa/mXl16g6/30388076520.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392195/normal_6007e2aeee1d7.pdfIn PDF document text
    • http://opt05.ru/telaragamumugipsysrh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1580f21e-fc75-4350-9669-3be8b7525729.filesusr.com/ugd/eff6cf_dc66bea77b734c27a1fa8babaf3062b2.pdf?index=trueIn PDF document text
    • http://lisiguzaxupego.epizy.com/tamokevuwefiwesuwoburit.pdfIn PDF document text
    • https://0e01c86c-6ad9-43de-bc04-b8819f410213.filesusr.com/ugd/73c254_4e39f461a8cc4ca2a67432c82aae5241.pdf?index=trueIn PDF document text
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_e5dca734c29a47cab8f8da36ca12e451.pdf?index=trueIn PDF document text
    • https://4de1274e-a26b-4e71-a0d1-d86f0cfee7ee.filesusr.com/ugd/ee4d88_0cc27558571b49bcb2f6d35e466e88f8.pdf?index=trueIn PDF document text
    • http://lejokadedemixo.rf.gd/49180077877.pdfIn PDF document text
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_6b113264adf94c4d897a6fef4f0ed2c5.pdf?index=trueIn PDF document text
    • http://lokezore.rf.gd/10th_class_maths_textbook_english_medium_2020.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_off0000f8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E5 5484 bytes
SHA-256: 0afda31d40e87d64961223b98ffb45844cd54d6c6841c74edd580268be43e07e
font_01_sfnt_off00010b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B73 11388 bytes
SHA-256: f063f35d8d3f89e9bc6843ee98f47d6534831292c6b120976dbefec617c2642d

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