Malicious PDF — malware analysis report

Static analysis result for SHA-256 22b1f275ea3d5266…

MALICIOUS

PDF

74.7 KB Created: 2021-04-01 10:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b7b994ebe73c81f5694ef06e201826e9 SHA-1: ed75388b3c27a79529d9ccab6379d1c008c02564 SHA-256: 22b1f275ea3d52662e8208e3df71fbd0d13f03aff5bd4bbda4be76674d358980
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent link leading to 'vilenefex.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, many of which are benign, but the primary malicious link is clearly identified. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/strik?utm_term=how+to+turn+on+tablet+without+power+button PDF link annotation
    • http://ighelpcenter.xyz/63944029268ebhip.pdfIn PDF document text
    • https://rasetakewalufil.weebly.com/uploads/1/3/6/0/136086978/fb9185947f37638.pdfIn PDF document text
    • http://scarcebook.com/tudanitodiz8nyvi.pdfIn PDF document text
    • https://biruwilajefi.weebly.com/uploads/1/3/4/6/134651793/goraxalut.pdfIn PDF document text
    • http://prequester.online/2006_harley_davidson_sportster_1200_custom_service_manualiqu4l.pdfIn PDF document text
    • http://ketotreno.buzz/tamil_words_pronunciation_in_englisheu1wy.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/lovomijelun/minecraft_1._7._10_cracked_team_extreme.pdfIn PDF document text
    • https://s3.amazonaws.com/zubata/frankenstein_pumpkin_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21469bd2-8258-46d0-ae63-3c886402a649/67811886120.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/bossanova_jawa_suket_teki.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/69735401603.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/15173040099.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/minn_kota_talon_8_weight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/702b73f7-df86-4e8d-9098-0a232119ae63/pukilawun.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/android_21_tier_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e280b864-9185-4956-9b57-0e02a8e2f613/cateye_cycle_computer_reviews.pdfIn PDF document text
    • http://rileponabamel.rf.gd/critical_thinking_its_definition_and_assessment.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/lista_de_verbos_irregulares_en_ingles_completa.pdfIn PDF document text
    • http://bopanexogu.epizy.com/abstraction_in_programming_language.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/simile_and_metaphor_worksheets_7th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6a6faf3-301c-4627-8d50-c8c18b413aeb/letter_of_intent_sample_for_buying_a_business.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_off0000e856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE856 4920 bytes
SHA-256: 6b9bd29f784d2bb4a383a10026e9a42c6e86d80d4af61d51ab41f6dbc7c83eb0
font_01_sfnt_off0000f912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF912 10732 bytes
SHA-256: 8b387e07e54f467b3776556106feaf3db4a334f4480c0fe0ce45aa7c32ea74bb

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