Malicious PDF — malware analysis report

Static analysis result for SHA-256 2634ec8e3c7978c9…

MALICIOUS

PDF

81.3 KB Created: 2021-03-21 05:21:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: b0cef8133d565d4e59b51698c7483811 SHA-1: 2916ee6c41b4186f7be1262f1def2455a764a27e SHA-256: 2634ec8e3c7978c9ff1a7797e3d8afbff3852c2302c05e6280f7b1b60a36a7b1
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM strongly suggest this malicious intent. The embedded URL and the ClamAV detection further support the classification as a phishing or malicious PDF.

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://jacksth.ru/strik?utm_term=why+my+smoke+detector+keeps+chirping PDF link annotation
    • http://loveworld.club/big_data_analytics_training_online_freen2orw.pdfIn PDF document text
    • http://kenugizi.getenjoyment.net/quantum_field_theory_demystified_free_download.pdfIn PDF document text
    • http://niluwipewuxasa.medianewsonline.com/carbs_in_bob_evans_mashed_potatoes.pdfIn PDF document text
    • https://tevidozeji.weebly.com/uploads/1/3/4/8/134887032/1846580.pdfIn PDF document text
    • http://pressit.space/62310316209djrg3.pdfIn PDF document text
    • https://funogefoxareso.weebly.com/uploads/1/3/4/0/134041001/sebojoxesupotezomib.pdfIn PDF document text
    • http://alania365.ru/67155864444q9x1.pdfIn PDF document text
    • http://nomokesus.sportsontheweb.net/how_often_does_league_of_legends_patch.pdfIn PDF document text
    • http://dikegebe.mygamesonline.org/how_to_reset_programmable_thermostat.pdfIn PDF document text
    • http://organic-ita.space/homelite_super_xl_automatic_chainsaw_manualr88yx.pdfIn PDF document text
    • http://pelistens.xyz/33830617865z5013.pdfIn PDF document text
    • http://sizinepizot.scienceontheweb.net/arrested_hydrocephalus.pdfIn PDF document text
    • https://notowupoguja.weebly.com/uploads/1/3/5/3/135316513/71d8f02.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
    • http://zaxuzut.atwebpages.com/mapa_turstico_bruselas.pdfIn PDF document text
    • https://4b0cdf75-2e42-4830-99f1-bbdbaec3f661.filesusr.com/ugd/891219_2fb6b19d55704102affa9a467a436cda.pdf?index=trueIn PDF document text
    • https://6593eeda-10fe-4128-810f-cbbc79f0a4f8.filesusr.com/ugd/c0a4bf_b2740beb635043a283d04a0004d47c7b.pdf?index=trueIn PDF document text
    • https://584dc5e1-4449-4bca-b3d9-d0e1fa08a972.filesusr.com/ugd/185caa_e6f6f42721a04afaa70f66310d35a9ab.pdf?index=trueIn PDF document text
    • https://506dbbd1-d4b3-44b1-a4c9-6b5d0cab6a23.filesusr.com/ugd/c75f60_7e1eb5f592f04d799cebe9cc8f0a6ccb.pdf?index=trueIn 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_off0000f0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C6 5212 bytes
SHA-256: 1cdf025086b82fa8bd74c63b9e48b7e5a61db9d064b8da70764652da127bb292
font_01_sfnt_off00010270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10270 11216 bytes
SHA-256: c0ecb25b96c5587cfea4104bc03dbc5a71eb795c3b51d899c1fc8deb6fb5926f
font_02_sfnt_off00012844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12844 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e