Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb5a3743d9666a1…

MALICIOUS

PDF

106.2 KB Created: 2021-04-06 07:33:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b92d8cb8d17cb25401077ac5f32175af SHA-1: 59cbfc231903464013c976bcd2f03550e8d9d9e4 SHA-256: cfb5a3743d9666a181d4a16df7eddb13fd439b38c72cf9438c3bc48d90f64b42
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 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/strik?utm_term=p21+cell+cycle+entry PDF link annotation
    • http://cybety.xyz/goxezag1sgoo.pdfIn PDF document text
    • http://dorodirebupekel.iblogger.org/bser_books_2020_18.pdfIn PDF document text
    • https://wuwosafojopog.weebly.com/uploads/1/3/1/4/131407683/0acc0dc75195e78.pdfIn PDF document text
    • http://setlyb.online/cbse_guidelines_for_class_12iy6ln.pdfIn PDF document text
    • https://takokapaxuv.weebly.com/uploads/1/3/0/9/130968961/dimurisijigitapada.pdfIn PDF document text
    • http://mif-smeh.space/how_to_program_my_hampton_bay_remotecqpnr.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/wegugus/40077686393.pdfIn PDF document text
    • https://c538924d-9290-4e35-808b-5013ecaac822.filesusr.com/ugd/047ea9_269c7ba2de43410e896485bccca209d1.pdf?index=trueIn PDF document text
    • http://danofida.epizy.com/rca_endeavor_10_hd_android_tablet_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/paris_self_guided_walking_tour_marais.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/sajasemevejobomile.pdfIn PDF document text
    • http://lejugolidisixod.rf.gd/collections_textbook_answers_grade_7.pdfIn PDF document text
    • http://vigewewemoxij.rf.gd/2883529122.pdfIn PDF document text
    • https://76bf42c0-7447-45ed-8dd3-33f9786ae3ae.filesusr.com/ugd/ba2c19_d53b0ff4feab47b1992b7be202aeca1b.pdf?index=trueIn PDF document text
    • https://0f7a2101-273c-4f7f-b1fd-079d1ad923c1.filesusr.com/ugd/a7ea6f_1cb77f9de5814668b29f53a45088c233.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/687c4c1e-17fe-4ef1-9f17-428400ff6378/oracle_sql_case.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81a46370-3ebd-4f8c-8cde-ad095f2a8079/how_to_use_fl_studio_11_for_beginners.pdfIn PDF document text
    • https://64f1e6a9-4530-4009-9f9b-67b91dd69f79.filesusr.com/ugd/76b6de_d7068332568446b8b22ba76f09566a4e.pdf?index=trueIn PDF document text
    • http://zepagol.rf.gd/nate_the_great.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/662e5ec4-0914-47e8-871a-05235dc805fc/bolens_lawn_tractor_parts_canada.pdfIn PDF document text
    • https://doi.org/10In 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A74 4692 bytes
SHA-256: 3e904e66771d7ea1cf066109388a9dd09093bc0bd30667c6b61914aebfba6151
font_01_sfnt_off00015a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A91 12696 bytes
SHA-256: 458a65fea94e44fcd589fa417ea083da78621d8b2669cdb9da9fe00bc95152df
font_02_sfnt_off000185a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185A8 16148 bytes
SHA-256: 98bbda09e34957c2c47eea570891e411fa41ced272e9777bbef021ce7395b75a

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