Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c7be760ab82e1a…

MALICIOUS

PDF

75.1 KB Created: 2021-02-26 19:59:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 902f74eaac2adb8e01cd441e0d30c803 SHA-1: 063dd586ea22464b87a8b499cdbfa24bdef146e5 SHA-256: d4c7be760ab82e1a0014d65ac8de2be4ab5b6f798d0ffdbf7050a824bdfa878b
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various PDF files hosted on different domains. One of the primary URLs, 'https://zajinet.ru/strik?utm_term=are+boss+speakers+good+quality', suggests a potential phishing or spam campaign. The ClamAV detection and ML classifier further indicate malicious intent, likely related to phishing or distributing further malware.

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 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://zajinet.ru/strik?utm_term=are+boss+speakers+good+quality PDF link annotation
    • https://muxasikij.weebly.com/uploads/1/3/1/8/131872285/5497814.pdfIn PDF document text
    • http://boputev.66ghz.com/paragraph_transition_words_worksheet.pdfIn PDF document text
    • http://begdas.space/weruzevuvalovojutezonuti07e7h.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/fluke_networks_pro3000_probe_user_guide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zerokafejedumij.rf.gd/betclic_apk_2019.pdfIn PDF document text
    • http://sasukagisodubex.onlinewebshop.net/star_trek_voyager_ship_vs_enterprise.pdfIn PDF document text
    • http://kosezofejesuxef.atwebpages.com/pojokel.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/spotify_music_offline_free.pdfIn PDF document text
    • http://pikubub.onlinewebshop.net/jogugafupixunodoxowuz.pdfIn PDF document text
    • http://fujesotes.epizy.com/maths_questions_and_answers_year_6.pdfIn PDF document text
    • https://s3.amazonaws.com/libosokune/cubs_schedule_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/81368976493.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/94759901682.pdfIn PDF document text
    • http://fozoxorosemaxo.epizy.com/38496440891.pdfIn PDF document text
    • http://sedinuposib.rf.gd/51162081259.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_off0000e8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D4 5548 bytes
SHA-256: 8b877b12d7e9eba84d5427993aef50b2de74ef5832d341c0efe9f544525ddfb1
font_01_sfnt_off0000fbc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC2 10480 bytes
SHA-256: 8bda29a4eef233a88fc03e3dfdfc0f92706e76660651ca9ba0890c0602e773d6

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