Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d543f59d14a5f96…

MALICIOUS

PDF

74.5 KB Created: 2021-02-28 06:11:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ce4df6dfb20f66e8f4fedaa5be2659c2 SHA-1: ee6d667483999686182b159bc2d3bb196cab969f SHA-256: 6d543f59d14a5f963cff947a0fdd6e40522941b336aae8b0cf4cb210428b1694
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting a link farm or phishing lure. The embedded URLs, such as 'https://jumiwimov.ru/strik?utm_term=why+my+acer+tablet+won%2527t+turn+on', are likely used to redirect users to malicious sites for further exploitation or credential harvesting.

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://jumiwimov.ru/strik?utm_term=why+my+acer+tablet+won%2527t+turn+on PDF link annotation
    • http://puveputado.sportsontheweb.net/gikewizopemeza.pdfIn PDF document text
    • http://dosijefa.mypressonline.com/jovet.pdfIn PDF document text
    • http://keepxufi.space/76276990345roj0.pdfIn PDF document text
    • http://jolixasij.sportsontheweb.net/moselafokekopapuva.pdfIn PDF document text
    • http://nowukusox.mypressonline.com/massey_ferguson_3545_decals.pdfIn PDF document text
    • https://bunemanedadon.weebly.com/uploads/1/3/4/4/134476229/detosetaf-piwufo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fufudaloxola.onlinewebshop.net/asus_via_audio_driver_windows_10_64_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/corbettmaths_2016_answers_5_a_day.pdfIn PDF document text
    • https://s3.amazonaws.com/pukaridimupo/the_night_manager_streaming_rai.pdfIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/rokumumazid.pdfIn PDF document text
    • http://zitadufafasid.onlinewebshop.net/a_christmas_carol_short_version_esl.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/vikivowavakifi.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/31340841805.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/tamilrockers_full_movies_hd_print_2018.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_off0000e4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B4 5244 bytes
SHA-256: 6bb0a795ae420198ff5a0c7c658b5674746e955a42705fa5d8d599f6dce45ab1
font_01_sfnt_off0000f680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF680 11480 bytes
SHA-256: 9875d546392597516e429f9e0d6d5cb7de7fada9c58c0412746eeb1a503637f0

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