Malicious PDF — malware analysis report

Static analysis result for SHA-256 f98bdf760010b77e…

MALICIOUS

PDF

83.9 KB Created: 2021-05-17 16:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 61ff50eee669385968aab0e4a4eb2015 SHA-1: 65da4fe017f6c3e1ae1a810ce240af71052e33b1 SHA-256: f98bdf760010b77e6bee181c16ef2dede913679e8d61332603402bbb87b7be66
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, flagged by the 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users to potentially harmful sites. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan. While no scripts were directly extracted, the PDF structure itself is used to host and present these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jottigo.ru/strik?utm_term=apple+ipod+nano+video+3rd+generation+4gb PDF link annotation
    • http://eduha.online/behringer_xenyx_x1222usb_price0v5lo.pdfIn PDF document text
    • https://cdn.sqhk.co/xaduwudixum/gqNphfY/56934332516.pdfIn PDF document text
    • https://tariroviwobin.weebly.com/uploads/1/3/4/7/134715354/a303c3921cc2905.pdfIn PDF document text
    • https://cdn.sqhk.co/bisulalu/piiXtgf/rabbit_population_gizmo_answers.pdfIn PDF document text
    • http://copyrighytsupport.com/why_my_gas_oven_isnt_heating_upm1jy5.pdfIn PDF document text
    • http://libralab.digital/nafusikopibozadakukpxg3k.pdfIn PDF document text
    • https://cdn.sqhk.co/fopikudapom/f0ijiju/digital_marketing_entry_level_jobs_chicago.pdfIn PDF document text
    • http://biomanua.website/xugezadamogebadopuwazuz4t1k.pdfIn PDF document text
    • http://trylait.pro/radio_spot_script_templatearm07.pdfIn PDF document text
    • http://rutonujak.iblogger.org/balance_sheet_meaning_and_definition.pdfIn PDF document text
    • https://mefiwipof.weebly.com/uploads/1/3/4/3/134320940/tagugujixag-nepijeb-xebiwokovodo-zijowa.pdfIn PDF document text
    • https://cdn.sqhk.co/wuxaguzifep/bM2S8ib/lannister_words_game_of_thrones.pdfIn PDF document text
    • https://teseresoj.weebly.com/uploads/1/3/4/6/134644138/2fe9b4d69f4097.pdfIn PDF document text
    • https://zezigejuto.weebly.com/uploads/1/3/5/3/135318470/c8af1e6.pdfIn PDF document text
    • https://janepaxe.weebly.com/uploads/1/3/4/0/134097288/ddb1d3e4c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/pet_answer_sheet_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/tejuduxagisonipi.pdfIn PDF document text
    • https://s3.amazonaws.com/pulavokaxe/30614523229.pdfIn PDF document text
    • http://zenadeguposu.rf.gd/7256225191.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/2012_toyota_highlander_oil_change_interval.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/sepomuralazixuvejep.pdfIn PDF document text
    • http://bunebuka.rf.gd/82583326502.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/rise_of_kingdoms_lost_crusade_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/resabomibogodaw/bronchite_aigue_traitement.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_off00010758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10758 5392 bytes
SHA-256: 399a94fc463a8708150613a2711bfe3bf91e8c4bfaf2a366e9cb6c36b1c971f1
font_01_sfnt_off000119ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CA 11656 bytes
SHA-256: c9f8d4e431ab9f201c3e5a4d51dc1f500d3e8f0fbd02bcc0fd18b8f50eff2647

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