Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c741fba08bb7041…

MALICIOUS

PDF

79.7 KB Created: 2021-04-07 06:40:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 9c4ad864baf6182d45cef4e10adab422 SHA-1: dbea7ad1a42325a696e72dc8f33109d89a2a447f SHA-256: 4c741fba08bb704197a928bb3febc7df9ce878b02f3dffebad775093bcde8cfc
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with the primary one being 'https://xezojetit.ru/strik?utm_term=nyuad+academic+calendar', suggesting a phishing lure related to academic information. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/strik?utm_term=nyuad+academic+calendar PDF link annotation
    • http://tasiperop.medianewsonline.com/joxorokotiziz.pdfIn PDF document text
    • http://lusolakidareve.mywebcommunity.org/discipline_and_punish_the_birth_of_a_prison._london_penguin.pdfIn PDF document text
    • http://mesikigodijope.mypressonline.com/86726921868.pdfIn PDF document text
    • http://pejazadajenatew.getenjoyment.net/list_three_adaptive_features_of_hydrophytes.pdfIn PDF document text
    • http://pelubexeto.getenjoyment.net/music_notes_meaning.pdfIn PDF document text
    • http://govuxojikasumot.scienceontheweb.net/21201539850.pdfIn PDF document text
    • http://nulivanofika.mygamesonline.org/jumeviduxikori.pdfIn PDF document text
    • http://tamogulaganero.scienceontheweb.net/difference_between_binomial_vs_cdf.pdfIn PDF document text
    • http://kojazunupetip.mygamesonline.org/bakery_business_plan_in_south_africa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://981168d4-05fc-44b6-871d-73371d7e8cf1.filesusr.com/ugd/87d215_5c8d9341a8d74b2c8505d99a71669511.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/428e62ee-1ceb-4f5c-a1ad-78ec1c32f13c/trane_mini_split_heat_not_working.pdfIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_69d18f86a15641a1be7e657a90b51c51.pdf?index=trueIn PDF document text
    • http://bilisedutave.myartsonline.com/xuwimexa.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/highland_village_tx_restaurant_guide.pdfIn PDF document text
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_89ad6f325bf94bc2b170b68cc7f1505e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/000ba313-2f51-4bcd-b354-7cc50e87f669/xokagemazufexuzekekagit.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/13270833176.pdfIn PDF document text
    • https://03dfb0eb-7fe6-4188-ad87-ea2b88df7b19.filesusr.com/ugd/f967ac_be913019cd91454d94ec1ece18768341.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bc90385-e44d-453e-bb91-ccb84971f2a8/riruxowekarune.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/facebook_lite_for_windows_8.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_off0000f8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EC 4976 bytes
SHA-256: 76a04ae17eb00eef25994b961c64f72dd497a71af95404659b6848c69b46b48c
font_01_sfnt_off000109cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CF 11972 bytes
SHA-256: 66c658637f29a21f6754d8ae139fdd383c44a832ef497432be832f0e5d6ac5a2

Open this report in the interactive analyzer, or submit your own file for analysis.