Malicious PDF — malware analysis report

Static analysis result for SHA-256 9311d65ef284bf8a…

MALICIOUS

PDF

84.6 KB Created: 2021-02-26 18:53:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 4b94770a30f605878e40626934b6856b SHA-1: db8b9a9c5417f0e41c33e145c397c8a16c3f32f2 SHA-256: 9311d65ef284bf8ad2ba34ac73437a87dd39fb85f9d168c86ae5a268966fe746
126 Risk Score

Malware Insights

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

The PDF contains multiple external links, with one specifically pointing to a URL related to 'survival of the fittest definition' on a suspicious domain. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable hosting, suggesting a phishing or spamming operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites for credential harvesting or malware distribution.

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://ponafet.ru/award?keyword=survival+of+the+fittest+definition PDF link annotation
    • https://luzatewuxajexi.weebly.com/uploads/1/3/4/2/134265782/5711675.pdfIn PDF document text
    • https://biwasigefo.weebly.com/uploads/1/3/1/3/131398444/jipimox-pafezu.pdfIn PDF document text
    • http://jusukigib.sportsontheweb.net/18890281816.pdfIn PDF document text
    • http://pixunune.sportsontheweb.net/sex_education_season_3_release_date_countdown.pdfIn PDF document text
    • http://kinemulawaw.sportsontheweb.net/how_to_read_anthropology_for_upsc.pdfIn PDF document text
    • http://terugate.mypressonline.com/do_seasons_of_the_year_need_to_be_capitalized.pdfIn PDF document text
    • http://sowopezamiw.medianewsonline.com/what_is_the_darkest_minds_available_on.pdfIn PDF document text
    • https://cdn.sqhk.co/xagaxubibiz/escriez/perfect_asmr_slicing_fruit_slice_3d_model.pdfIn PDF document text
    • https://tinulesuse.weebly.com/uploads/1/3/4/6/134689832/9479517.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/tufitijinexu/44155860602.pdfIn PDF document text
    • http://dibirat.rf.gd/fluid_dynamics_physics.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/gobubinomewi.pdfIn PDF document text
    • http://fuvarijes.atwebpages.com/45211061044.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/java_runtime_old_version.pdfIn PDF document text
    • http://mebupeb.rf.gd/symptoms_of_coliform_bacteria_infection.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C8 3396 bytes
SHA-256: 9542a116d138b265c4882f9113d19e3c4f43916f31be220c94b7e8e87dc6e563
font_01_sfnt_off00010eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEE 5160 bytes
SHA-256: 9ac4a73bc74d63857d0493538fac828d02273e84ab9c1dada7f742093e6f75a9
font_02_sfnt_off00012076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12076 10640 bytes
SHA-256: f01f65a279fe19de49db7972817903925d8663c20f81489c600dfd3f147290aa

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