Malicious PDF — malware analysis report

Static analysis result for SHA-256 931e37b57ed3bcf4…

MALICIOUS

PDF

71.7 KB Created: 2021-02-24 01:37:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 050d07a567af4a61b2e8105193ab2448 SHA-1: 6665f077f39ee2ee277274639c42bb511739b5b1 SHA-256: 931e37b57ed3bcf4f1038f2b662c7ca04041b6d2ad07ab2b47a0325b74c1a1ad
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-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://crophysi.ru/wix?keyword=spyder+victor+2+manual PDF link annotation
    • http://dirtygirl.fun/monica_her_story_bookdi2pv.pdfIn PDF document text
    • http://kopolade.22web.org/korg_sv-1_midi_driver.pdfIn PDF document text
    • http://copyrightsupport-ig.com/binomial_theorem_worksheet_answer_keycoh64.pdfIn PDF document text
    • http://mandarin-fruit.space/berlin_syndrome_bookpvjv0.pdfIn PDF document text
    • http://shmelev.pro/corazon_espinado_sheet_musicd9rev.pdfIn PDF document text
    • http://free-at.pro/swanson_vegetable_broth_nutrition_informationn4c9u.pdfIn PDF document text
    • http://supermagazforsale1.xyz/animal_cell_culture_protocolpkrjr.pdfIn PDF document text
    • http://frut-tree.site/how_to_read_bryant_furnace_codesqyjm3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500001/normal_60358c55a6b68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456121/normal_6025afe7a1988.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392444/normal_600f0a6194a9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451353/normal_60233ac91626c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475572/normal_5ff4f3b6be471.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482638/normal_5fe96899b5357.pdfIn PDF document text
    • http://dubiniba.iblogger.org/cardo_scala_rider_packtalk_bold_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480187/normal_5ffa6924baf39.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/toguvaju/rijasufozisesiba.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/goodman_furnace_spec_sheet.pdfIn PDF document text
    • http://siberasule.rf.gd/say_thank_you_in_korean_informal.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/a7_envelope_template_free.pdfIn PDF document text
    • http://mowelafawugek.epizy.com/45785556063.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/differential_gene_expression_report.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_off0000d7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B0 5440 bytes
SHA-256: 688c96ab2550f59280835e7af86b7af20a06ef563fade0fb26349def4eb4d091
font_01_sfnt_off0000ea2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2B 12476 bytes
SHA-256: 5b1e0aed113bcbc1c5d04c8f38dca35a08edfb3e266a1160e361ced0f54e392a

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