Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9ecb2a10b5affbf…

MALICIOUS

PDF

82.2 KB Created: 2021-03-14 04:57:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 03d3305e353dba5940634cde5ddbd03b SHA-1: a517a13f9bfff3e03f2425e1ddb21c03e471c262 SHA-256: b9ecb2a10b5affbf8d1e41786527b9f43190f53b37849a58bd6506c72578edb8
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 one prominent URL pointing to 'kuzutuzo.ru' and using a search term related to car engine oil, suggesting a phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host many links on disposable domains, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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://kuzutuzo.ru/strik?utm_term=2017+toyota+camry+se+engine+oil PDF link annotation
    • http://kogejirupu.getenjoyment.net/celsus_de_medicina.pdfIn PDF document text
    • http://operationhomeplate.com/22365891016vg7q6.pdfIn PDF document text
    • https://gozerezujokosas.weebly.com/uploads/1/3/4/8/134856803/gaxulovinixoxibazuli.pdfIn PDF document text
    • http://termometr-medikal.site/38721522372dj0m7.pdfIn PDF document text
    • http://xixabibalusuzip.22web.org/54946813462.pdfIn PDF document text
    • https://fetibafavi.weebly.com/uploads/1/3/0/7/130776688/regejedofoxasaxod.pdfIn PDF document text
    • http://dfwshootersupply.com/business_administration_and_management_courseyj96y.pdfIn PDF document text
    • http://pipavinekiga.mywebcommunity.org/murobu.pdfIn PDF document text
    • http://negeduji.66ghz.com/nikujarifonogubukexo.pdfIn PDF document text
    • http://zolepop.mypressonline.com/introduction_to_linguistics_columbia.pdfIn PDF document text
    • http://help-feedback-amzn6.xyz/fatamuwosobivetufisuxiklg01d.pdfIn PDF document text
    • https://sekeratogo.weebly.com/uploads/1/3/4/6/134683690/liwavedewimirawufuso.pdfIn PDF document text
    • http://mowisadewojapu.22web.org/kejanigubogibalebewo.pdfIn PDF document text
    • http://sowopezamiw.medianewsonline.com/rulifadonofurabakodosez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vewajelawukos.rf.gd/cake_making_games_for_pc_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92ccf16e-a3f3-4b12-86d2-3798d2ecca73/6696855638.pdfIn PDF document text
    • http://wirowobizofox.epizy.com/bihar_daroga_pt_question_paper.pdfIn PDF document text
    • http://taxowojo.epizy.com/diploma_civil_engineering_books_free_download_in_hindi.pdfIn PDF document text
    • http://wixufoliwesomep.epizy.com/yantam_marathi_song_video.pdfIn PDF document text
    • http://zufelagek.rf.gd/bloodborne_ludwig_the_accursed_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/267058c4-a11b-42fd-96fb-dfcb9a48d1a9/bible_verses_for_weddings_old_testament.pdfIn PDF document text
    • http://duxemebuwejaw.rf.gd/51722299941.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf87b0ed-7fb7-4fa7-8939-ee6cbf59aa3e/35850270901.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_off0001035c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035C 5532 bytes
SHA-256: 2e9f912d29d20fac1d0f67f1117b10c88641a28724c6f7e587b28aa85b398139
font_01_sfnt_off00011628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11628 10976 bytes
SHA-256: a52995cc5db5155b75bac4859de64a2c230c8a80a595b804f5371c24568fa7dd

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