Malicious PDF — malware analysis report

Static analysis result for SHA-256 c984d3629e42cf1c…

MALICIOUS

PDF

77.0 KB Created: 2021-04-06 21:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 51de40d2aaac2b38c63a32596c662529 SHA-1: 5547d62c19cae0ac035bd95037695851660ee15a SHA-256: c984d3629e42cf1c191c7d3966e1586e13d7f9533fb93dd2cdbe22c5deb752c0
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 0.9999

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://fokemale.ru/award?keyword=cancer+de+prostata+pdf+mexico PDF link annotation
    • https://gofupadosu.weebly.com/uploads/1/3/4/8/134853885/22d249fb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373797/normal_600cf3e5696e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404113/normal_5fff5744263b7.pdfIn PDF document text
    • https://gejidodedawo.weebly.com/uploads/1/3/4/0/134018108/8818149.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497079/normal_5feb168f7abea.pdfIn PDF document text
    • http://gitipakivo.iblogger.org/grundig_satellit_750_antenna.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474978/normal_5fce5e5aa408c.pdfIn PDF document text
    • http://xujimutisep.iblogger.org/new_wave_tv_channel_guide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d25e5d79-f3dc-43ab-8538-58f2f4730235.filesusr.com/ugd/898300_1a6d07a1a5c8415387e0ae5db66c5f0a.pdf?index=trueIn PDF document text
    • http://bamasagure.epizy.com/9th_grade_math_lesson_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/fejinugizaraweb.pdfIn PDF document text
    • http://zalimoruxisonik.rf.gd/30634622408.pdfIn PDF document text
    • https://5b949be5-44ef-49af-96c7-0ebaa8fe632e.filesusr.com/ugd/3402b1_2f97fa11c77c40d18ed268cf7a3cd2c7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kujapomib/rakasipofesebujifaronopi.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/bawra_mann_mayanadhi_song.pdfIn PDF document text
    • https://9e1b5e4e-b4ab-405b-8fdf-b3b6d7b19c28.filesusr.com/ugd/94ea38_db3e38ef95a9450181ef3786f17292f5.pdf?index=trueIn PDF document text
    • http://giraxajo.epizy.com/graco_nautilus_snuglock_lx_3-in-1_harness_booster_walmart.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/daxifek.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_off0000eac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC0 5244 bytes
SHA-256: 967187c36e80c67c78f074bd0286bf5f883278bfad973f24cd4ba847186e20aa
font_01_sfnt_off0000fc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7E 12800 bytes
SHA-256: 7a2eaae171913d4a536c6d431032382b461977044c389b1a9e6b550c3d53622c

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