Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a1bb25fa7f8ad7a…

MALICIOUS

PDF

78.1 KB Created: 2021-02-21 01:26:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: fdd4001cfa9edd59eec61dd0a00bdcda SHA-1: 718f7c21d147f397751ea4fbedd7513020b8627b SHA-256: 0a1bb25fa7f8ad7aaa320dde2f2c6255869e85113ac224f00f84145c9c6eeb50
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to training courses, which is then used to redirect the user to a malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=eyelash+extension+training+course+manchester PDF link annotation
    • https://cdn.sqhk.co/pugudanirav/s0Aggij/stack_blocks_3d_level_434.pdfIn PDF document text
    • http://jepoletas.iblogger.org/multiplying_fractions_by_whole_numbers_worksheets_tes.pdfIn PDF document text
    • https://nagiwavimev.weebly.com/uploads/1/3/4/6/134612684/rosiwuxod_derudu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405420/normal_600fd5a137ece.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387040/normal_5feb267d077cb.pdfIn PDF document text
    • https://tigasuzile.weebly.com/uploads/1/3/1/3/131379741/tevuko.pdfIn PDF document text
    • https://pixumoxijabana.weebly.com/uploads/1/3/4/7/134748481/8517122.pdfIn PDF document text
    • https://litepuvib.weebly.com/uploads/1/3/4/7/134741427/8ef29b3a19.pdfIn PDF document text
    • http://wagekelazutus.22web.org/debolt_weather_report.pdfIn PDF document text
    • https://cdn.sqhk.co/kixobaza/yFgejh0/21918274074.pdfIn PDF document text
    • http://xevamaz.iblogger.org/manualidades_faciles_y_utiles_para_vender.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387061/normal_602f23abaa66f.pdfIn PDF document text
    • https://cdn.sqhk.co/fipufose/Thcihge/real_basketball_games_download_for_laptop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467561/normal_601a42f2d5fc4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jibaberumakome.rf.gd/nudat.pdfIn PDF document text
    • http://sovizaz.epizy.com/79652850702.pdfIn PDF document text
    • http://fifonuvis.epizy.com/alexander_the_great_empire_after_death.pdfIn PDF document text
    • http://fibubaxuvuvixik.epizy.com/54534699364.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/crystal_reports_8._5_professional.pdfIn PDF document text
    • http://vadufitewaseru.epizy.com/69366337109.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_off0000f2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2ED 5340 bytes
SHA-256: feeeee0dca67d5a4b6750f26f99a45ea022cbae4141a341503a2fcced6676cd7
font_01_sfnt_off00010501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10501 10884 bytes
SHA-256: ded945fbde19a65b3042da1dc85e2f724ffc1a4a046192eef92cd39a29a92306

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