Malicious PDF — malware analysis report

Static analysis result for SHA-256 a117c87256d21cbb…

MALICIOUS

PDF

74.8 KB Created: 2021-05-24 00:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e246f1335a79ad0b3f98dfef21f3e287 SHA-1: 262467469424799e248876a9dc3189135388bc79 SHA-256: a117c87256d21cbb9f94d747022f8d60c5b21f1249929dde96085c770d7c0e44
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, indicating a phishing or trojan-like behavior. It contains a large number of external links, many of which point to other PDF files, suggesting a link farm designed to obscure malicious intent. The primary malicious URL identified is `https://bologen.ru/strik?utm_term=my+hero+academia+vol+1+pdf+free+download`, which likely serves as a lure or redirector.

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://bologen.ru/strik?utm_term=my+hero+academia+vol+1+pdf+free+download PDF link annotation
    • https://kabapavubume.weebly.com/uploads/1/3/4/7/134742816/49b92d.pdfIn PDF document text
    • https://pajejasebuwosiw.weebly.com/uploads/1/3/0/8/130813778/8d7d40.pdfIn PDF document text
    • https://sivubatololux.weebly.com/uploads/1/3/4/8/134850937/21b46437a6bc.pdfIn PDF document text
    • https://biwimukapol.weebly.com/uploads/1/3/1/3/131398517/kinaposux-mexanatidod-betinim-rojoza.pdfIn PDF document text
    • https://tenosufude.weebly.com/uploads/1/3/1/4/131455069/2d10a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bf59a38-caaa-4b00-b6c7-43d3997890c8/2nd_grade_reading_workbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/449ef172-3922-4d33-ad3a-31793dc5960b/firefox_portable_49_32_bit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77ef3aae-d5ab-4c7c-b5a3-a1efd67ee8ea/how_do_i_know_if_my_golf_cart_battery_charger_is_bad.pdfIn PDF document text
    • https://s3.amazonaws.com/fivebo/59851226596.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/bible_study_fellowship_answers_lesson_16.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fad74956-4bd5-4d4e-8308-bc6179c92a95/how_to_sight_in_a_barnett_jackal_crossbow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54a50de1-e172-4d62-aa0a-cae86b9a63a2/sufaporurimujagadutolusiz.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/63003258079.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/como_convertir_gramos_a_mg.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/banarasiya_mp4_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/mediaget_mac_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db7b4f6d-454c-458e-97c0-c45578757757/catholic_childrens_prayer_book.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/23370975930.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/sifutagunevisog.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/biomedical_waste_disposal_methods.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_off0000dfc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC3 5528 bytes
SHA-256: 6f25eb3ecd91ca201072d9305a6777c049298d64376e3784952069fe1948c736
font_01_sfnt_off0000f291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF291 12844 bytes
SHA-256: 9fe9751e29a804515ac18828b2d83972f360134c60c6e49b92e19205ec7d8389

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