Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bb7900fe5d4ca68…

MALICIOUS

PDF

75.4 KB Created: 2021-03-10 14:50:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bba56769120db02fac00b576d9cf906b SHA-1: d55bc594bba9b650aedd96601997e0b106104628 SHA-256: 5bb7900fe5d4ca683fe1d506249e697d3653648a1b8e03b3bb6c98da280c4b28
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, suggesting a link farm or phishing campaign. While no scripts were explicitly extracted, the presence of PDF_URI and PDF_SEO_LINK_FARM heuristics points towards the exploitation of PDF vulnerabilities or features to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=is+the+yeti+microphone+good+for+singing
    • https://ganokupojedozo.weebly.com/uploads/1/3/4/8/134890080/kaxaveja.pdf
    • https://cdn.sqhk.co/dedejosewor/iXUiixT/21849300397.pdf
    • https://sosijujanakuf.weebly.com/uploads/1/3/5/3/135387992/2af3cbc997.pdf
    • https://cdn.sqhk.co/wifilivemij/lhc6idu/zolaxasodatuwewagiwep.pdf
    • https://jotulamopusojo.weebly.com/uploads/1/3/4/4/134465369/vadufaxugekol.pdf
    • https://betirowi.weebly.com/uploads/1/3/4/6/134661799/suxen.pdf
    • https://cdn.sqhk.co/kepozote/fWj9muf/voguzepelidumolipepapa.pdf
    • https://xofoxinef.weebly.com/uploads/1/3/0/8/130874051/mujazumavomi-zorubewixuti-zuderelux.pdf
    • https://cdn.sqhk.co/ragojagef/lfhegfl/espn_events_today.pdf
    • https://bikonate.weebly.com/uploads/1/3/4/7/134715396/tuwip.pdf
    • https://katibaluzopoxu.weebly.com/uploads/1/3/0/7/130738884/xupagigufisose-lamipapubinikuk.pdf
    • https://cdn.sqhk.co/teposodigar/4ejdifq/jezowovemamumatim.pdf
    • https://cdn.sqhk.co/rusefijow/hchagiO/88384071303.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vafegenowakimo.epizy.com/hulk_meme_endgame_template.pdf
    • https://uploads.strikinglycdn.com/files/c016459a-ee64-48ce-a4cc-2db9095d4450/the_boy_who_harnessed_the_wind_review_questions.pdf
    • http://bokonejedebi.rf.gd/font_horizontes_script_bold.pdf
    • http://zatojigetafugud.epizy.com/7th_unit_9_environment_vocabulary_worksheet_cevaplar.pdf
    • http://xejimeve.rf.gd/likusimiruvut.pdf
    • https://uploads.strikinglycdn.com/files/defd5656-73f7-45e0-8e88-8523966b666a/ferrari_california_t_price_malaysia.pdf
    • https://uploads.strikinglycdn.com/files/d66e8fbc-4f85-4cd9-9d8c-99ea1d308aa2/how_to_weld_aluminum_with_mig.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea9f.bin
9a73027c6bd3a4fcabff1ea40ada855b0fb1ca994ce4c7afa7f8a6f8229c8273		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9F 5368 bytes
font_01_sfnt_off0000fcc7.bin
e1c7c5c1bf7b3eb03a6967389037d35f5d17e349d65e52b11d24beec2200b6e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC7 10388 bytes

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