Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b2d5eb6fe7c006d…

MALICIOUS

PDF

85.0 KB Created: 2021-03-02 19:21:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b72e5446181071d6783af20861b30e1c SHA-1: 87a391b60780995d03c346cdfa47245d87b83a63 SHA-256: 5b2d5eb6fe7c006de85603cc2b35b28f1c6274094f7dcd0590414ae108e15811
166 Risk Score

Malware Insights

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

The PDF contains multiple links to disposable domains, a common tactic for phishing or malware distribution. The heuristic 'PDF_RANDOM_URL_LINK' specifically flags a link to 'http://privateguardingserviceagainstdanger.site/installment_plan_agreement_template4ygsk.pdf', suggesting a lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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/award?keyword=how+to+access+bios+on+acer+aspire+laptop PDF link annotation
    • http://ceter.xyz/as_bill_sees_it_daily_readingjgcqx.pdfIn PDF document text
    • http://parrrtner.xyz/xorozuforipume4lc11.pdfIn PDF document text
    • http://supernefritroller.xyz/doom_3_bfg_edition_apk7wqkj.pdfIn PDF document text
    • http://podarokinsta365.site/kegorifanowuloei6ew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376621/normal_5fef13f514ce0.pdfIn PDF document text
    • http://sayfelengs.space/smythson_notebook_review49ul0.pdfIn PDF document text
    • http://temppicture.xyz/smartthings_hub_v4u2f4d.pdfIn PDF document text
    • http://biomaniix.website/best_free_app_for_counting_calories_ukxmd9x.pdfIn PDF document text
    • http://derabaxudofofo.22web.org/6498792198.pdfIn PDF document text
    • http://privateguardingserviceagainstdanger.site/installment_plan_agreement_template4ygsk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497359/normal_5ffe50ef1be9a.pdfIn PDF document text
    • http://copyrightproblem.com/xuguxavolefesll0z5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417308/normal_5fe78b4ca3769.pdfIn PDF document text
    • http://detonic-ordina.website/gefatovezugad4bn9g.pdfIn PDF document text
    • http://lami-lashes.site/blood_glory_legend_apkjt8vz.pdfIn PDF document text
    • http://aov.one/gipalizokikufaxiwew90ocm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dugafoto.epizy.com/83265139306.pdfIn PDF document text
    • http://gebopotaxe.rf.gd/nccn_kidney_cancer_guidelines.pdfIn PDF document text
    • http://nudibiwer.epizy.com/human_skull_anatomy_atlas.pdfIn PDF document text
    • https://s3.amazonaws.com/megulu/enthalpy_change_of_reaction_definition_chemguide.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/pawnee_tribe_clothing.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/73771001049.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/tretorn_barnstvlar_storleksguide.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/konica_minolta_c224e_driver_windows_7_64.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_off000110fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FC 5120 bytes
SHA-256: 405d20e673e2f1df0c41e2af6d4141380918f2ed5beed64f3bcac9ecb9fd9566
font_01_sfnt_off0001227e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227E 10456 bytes
SHA-256: e88e7dcb8fbc5252a66b445b73eb6f77d39607532369d3acfd676c49ede77e08

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