Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf02838fa109e589…

MALICIOUS

PDF

102.3 KB Created: 2021-04-01 23:21:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: aa6ce4308b7890d7059e0b2821db9e3d SHA-1: da4d569c345124794be0e8e8b1297d7425abcaea SHA-256: bf02838fa109e5893ea77e16a109fe36d54606597d2796716ec0c3d83ca49254
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jumiwimov.ru/123?utm_term=angamaly+diaries+malayalam+film+songs PDF link annotation
    • https://gexamefirizawem.weebly.com/uploads/1/3/4/6/134668325/daxelexag.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://cdn.sqhk.co/zedozomi/gjihjfv/jiwodaxi.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/s5DjeuH/malawi_music_top_100_mobile_chart.pdfIn PDF document text
    • https://cdn.sqhk.co/mejapevelu/0gcifhf/photo_collage_maker_app_for_pc.pdfIn PDF document text
    • http://vafumukiwafi.iblogger.org/bridal_shower_emoji_game.pdfIn PDF document text
    • http://biolinkus.me/botugefimekawiwobiwurec8nh9.pdfIn PDF document text
    • https://bovaromekefa.weebly.com/uploads/1/3/4/4/134403346/972e1dd5ded.pdfIn PDF document text
    • https://cdn.sqhk.co/wabajevebe/gCDjaqr/golexozafa.pdfIn PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/vgiHidf/sunny_bunnies_magic_pop_blast.pdfIn PDF document text
    • http://matras-24.ru/57443639082sb0rd.pdfIn PDF document text
    • http://jojenulowivot.22web.org/galvanic_cell_worksheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445750/normal_60447220a1fc3.pdfIn PDF document text
    • https://fuwofinirofen.weebly.com/uploads/1/3/1/6/131637723/2817135.pdfIn PDF document text
    • http://mebel-albero.ru/elementary_differential_equations_and_boundary_value_problems_9th_edition_solutionsqrj0g.pdfIn PDF document text
    • http://gbo.guru/how_to_calculate_estimate_in_civil_engineeringtao5m.pdfIn PDF document text
    • https://kekufekogaj.weebly.com/uploads/1/3/4/7/134768560/3aa6774b966df30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459054/normal_6063d99b161d7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://defefefesid.rf.gd/benokogiwipigewadi.pdfIn PDF document text
    • http://gamutazuzores.epizy.com/jukigitolosa.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/creative_writing_topics_for_grade_3_in_urdu.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/exalted_2e_weapons.pdfIn PDF document text
    • http://jimanujomubil.epizy.com/36701805264.pdfIn PDF document text
    • https://s3.amazonaws.com/kudefem/rujaxivunabofaza.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_off00015404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15404 5316 bytes
SHA-256: b442a7df3819d7228419e04d34a3066de74bad29fe9a67c8ba66bad4786595f0
font_01_sfnt_off0001660f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1660F 10996 bytes
SHA-256: 913951245c6ce2d056de2df4bce107beebac0a0db65a0e64cc1ee56830fd7a5a

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