Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2b1bae1afb02240…

MALICIOUS

PDF

80.2 KB Created: 2021-05-12 07:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bf542da0f28da4b93331f4f885d00075 SHA-1: df1bd0ac1102f2ea5284abc23ca984eb998b2d1e SHA-256: b2b1bae1afb02240b2ae45aca61582e4cb3f0b09b7adc1a6ab922dd154a6f56b
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://jacksth.ru/strik?utm_term=how+to+calculate+business+taxes+canada PDF link annotation
    • https://zemizipip.weebly.com/uploads/1/3/4/0/134098502/cb62996cbd76.pdfIn PDF document text
    • http://lishop.site/rosies_walk_worksheetnewyn.pdfIn PDF document text
    • http://oyuncuxx.com/how_to_become_a_high_school_superstara0z03.pdfIn PDF document text
    • http://fito4ka.xyz/aquarelle_font_free5e7wv.pdfIn PDF document text
    • https://pumewigegokofav.weebly.com/uploads/1/3/4/3/134317234/4258121.pdfIn PDF document text
    • https://wubenigulusetib.weebly.com/uploads/1/3/4/7/134712949/wufun.pdfIn PDF document text
    • http://ita-yog.space/java_programming_language_free_online_coursedqjfy.pdfIn PDF document text
    • https://zupelewelasilag.weebly.com/uploads/1/3/4/5/134594614/sefoj_tigojimofikiw_ligirupalevegev.pdfIn PDF document text
    • https://nexojavadu.weebly.com/uploads/1/3/0/7/130775828/vivikodutef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/32ac25c5-6b47-405c-9329-d1ab9e4076e8/full_stack_project_with_react_and_spring_boot.pdfIn PDF document text
    • http://kimizajoveso.epizy.com/lizozemufib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b158c56-ba54-4895-b6cc-c41b1cba4e77/87455268166.pdfIn PDF document text
    • http://bobitemobo.epizy.com/puwawonujumalu.pdfIn PDF document text
    • http://rabopakuzu.epizy.com/43873938206.pdfIn PDF document text
    • http://momesesewoja.rf.gd/flow_mihaly_csikszentmihalyi_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b88be42f-c65f-4e69-bfed-9089f638ef33/percy_jackson_lightning_thief.pdfIn PDF document text
    • http://kesinusaxaduveg.epizy.com/candidase_de_repetio.pdfIn PDF document text
    • http://rujamodi.rf.gd/30343824656.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a507bada-c600-492b-9eeb-c78f4061ce5c/83407193434.pdfIn PDF document text
    • http://kazigolukujo.epizy.com/xopumasuwikasafukivavajo.pdfIn PDF document text
    • http://venugowus.epizy.com/32998278306.pdfIn PDF document text
    • http://jajeridusepit.rf.gd/3581786054.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_off0000fc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC58 5100 bytes
SHA-256: f9c042d42e77031393ea732337682da307eee47f8dd5beb14a05b25ca51adeb1
font_01_sfnt_off00010dcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCF 11324 bytes
SHA-256: 8fcecf107e49f1531aa7c6031fa5f360943c21441d3750892b1bcceb0a549d67

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