Malicious PDF — malware analysis report

Static analysis result for SHA-256 830bd41f05f8a9a3…

MALICIOUS

PDF

78.2 KB Created: 2021-03-17 08:22:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: db7c6fead863b7ca0fefe3ed5cc75580 SHA-1: ea6d1e3709fafb13e6da807d57dd62012db61b49 SHA-256: 830bd41f05f8a9a301339ac7815da2579f47e5752a6b0f9adc3e9b0e5d07c119
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one specifically pointing to 'bologen.ru' and disguised as a game guide. The 'PDF_SEO_LINK_FARM' heuristic indicates a mass of external links, suggesting a link farm or redirection scheme. ClamAV detection and ML classification confirm malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://bologen.ru/123?utm_term=fate+grand+order+game+guide PDF link annotation
    • https://marikikugawu.weebly.com/uploads/1/3/5/3/135326377/49bc5cdd0.pdfIn PDF document text
    • https://zofitete.weebly.com/uploads/1/3/2/7/132740948/dazoj.pdfIn PDF document text
    • https://posilopawirina.weebly.com/uploads/1/3/4/3/134353572/3339156.pdfIn PDF document text
    • https://dumuzuvo.weebly.com/uploads/1/3/4/6/134695275/657594.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/fewifuwu/bumokevetuj.pdfIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/human_warlock_leveling_guide_classic.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/fact_sheet_example.pdfIn PDF document text
    • https://c827806f-f9bf-4fd3-a4ce-e487c020fa79.filesusr.com/ugd/6fd45c_de29005e6ee74b97819a90d23aa75cd5.pdf?index=trueIn PDF document text
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_8f1cc949ac85495c988265d3dc0ae0a0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d0434c0-9598-42f9-86cc-0107201f88c7/how_to_change_fuel_filter_25_hp_mercury.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/phonetics_and_phonology_by_peter_roach.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/e_news_reporter_with_cancer.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/82312044508.pdfIn PDF document text
    • https://s3.amazonaws.com/fasudikek/how_long_to_bake_a_medium_sized_sweet_potato.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfc73b76-7973-46d6-b469-cd11826551ea/how_to_play_guitar_step_by_step_dk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7d1b3c4-b0b0-4b58-85a8-5a087127ad75/what_is_the_role_of_o2_in_oxidative_phosphorylation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b69577c1-b454-444b-8060-012dc4402386/bissell_vacuum_cleaner_model_2030c.pdfIn PDF document text
    • https://22520ec4-2132-45a5-98b8-54db1b71d3ea.filesusr.com/ugd/b33b96_4bd7dd8945a246378fbea3b6661b5815.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/petikamov/96184408366.pdfIn PDF document text
    • https://de461234-8179-4892-b46d-67dc01ae00af.filesusr.com/ugd/69bbc5_18bbb623f0d74dfba0a2ccad848203f5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sisaxu/wawetaso.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/aakasamantha_movie_songs_free_320kbps.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/44574686861.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_off0000f4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F0 4888 bytes
SHA-256: 2eb3b7e7eaf4ee8392426c5ee78ba747126010607a7f7906c3581d988094d0c7
font_01_sfnt_off00010580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10580 11088 bytes
SHA-256: 813b22387ea64b957cfe5024bbedc64ecaf695418d6cfde6569a6ee2c212d1db

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