Malicious PDF — malware analysis report

Static analysis result for SHA-256 44c4331905a572e4…

MALICIOUS

PDF

79.5 KB Created: 2021-04-08 09:16:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 17c1f2f192707e5ebb7c53be970f5661 SHA-1: 52c307904ad1cc801a13cc97c20fe82f1ca731cd SHA-256: 44c4331905a572e44d918db0485465710d578067b6de76c2b5da4312b674c7df
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 ClamAV and 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 0.9995

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 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://dafemum.ru/wix?keyword=biological+molecules+pogil+answer+key PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4409614/normal_5fcc998eac106.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379837/normal_601e02c16d699.pdfIn PDF document text
    • http://watenaz.iblogger.org/kamenerajafikapojoju.pdfIn PDF document text
    • http://jirenaxapibetig.scienceontheweb.net/15922954.pdfIn PDF document text
    • http://tevajevidiwa.22web.org/the_5th_wave.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450418/normal_5fe7cfb452572.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://vipotunopadilez.rf.gd/tedorazomikedulesoze.pdfIn PDF document text
    • https://0e627107-309b-4451-a84d-e7064c41fccd.filesusr.com/ugd/04c368_f3780ccb67f04331a2e3d9a681127f98.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/satudifin/predator_2500_inverter_generator_manual.pdfIn PDF document text
    • https://e22e8d81-f41f-4d51-abb1-39b19d2d32bb.filesusr.com/ugd/96bf9d_7600b28c83c446709ffdf49439764167.pdf?index=trueIn PDF document text
    • http://todiwefexoneb.atwebpages.com/76364154945.pdfIn PDF document text
    • https://d05b2b94-0af3-401c-a6ef-75d00d0b58ae.filesusr.com/ugd/3bca44_fa250f1af0264e8d80798271511e9f48.pdf?index=trueIn PDF document text
    • http://gazugitub.epizy.com/kajawir.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/xikunaputefewepixugunaper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/524d8181-1064-4a12-950e-18116a2f65f9/what_should_my_daily_calorie_burn_be.pdfIn PDF document text
    • http://gifidabula.atwebpages.com/how_to_do_scoliosis_treatment_exercises.pdfIn PDF document text
    • https://3df06c22-1e8a-4082-8cc2-a0fdc0609706.filesusr.com/ugd/d86e81_a29c9308c46e4fe297cc557e1dc7bba8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/novifamigot/wouxun_kg-uvd1p_programming_cable_schematic.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/how_do_you_write_quadratic_equation_in_standard_form_give_2_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/nfl_injury_report_week_9_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/103cd950-2ecb-4a10-9b1b-abaf06786f82/how_to_use_speed_queen_top_load_washer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbbb86fe-b2cf-473b-af6f-8a9a2f0b9846/pukosotaxisi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA04 5360 bytes
SHA-256: 9253bd48e99cfa043c1ced65b05969b80db85751b838ed8d180bdcbb49d758c7
font_01_sfnt_off0000fc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC37 11256 bytes
SHA-256: d15c3070db37c14126dc30a073328fcad4216ab8b54ef07fc9504552d23a61b9
font_02_sfnt_off00012251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12251 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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