Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb80670344597370…

MALICIOUS

PDF

94.0 KB Created: 2021-03-18 11:40:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 323942a9b206b6eaa975e01155c7a628 SHA-1: 12b2daded19be78595176ba0fe5b01a7b6942966 SHA-256: bb806703445973704c80b570ae8e964b4b3576668d87164dceb4dc87f418fca5
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically mimicking a search result for educational material to lure victims. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and extensive link farm suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gimoguvi.ru/award?keyword=ncert+maths+textbook+for+class+8+pdf
    • https://cdn.sqhk.co/tisezalave/ciiHfjc/slices_pizza_saugerties_menu.pdf
    • https://cdn.sqhk.co/zitiwofiru/gecgsDi/votiwivafake.pdf
    • https://cdn-cms.f-static.net/uploads/4368998/normal_601a6e5f91a71.pdf
    • https://cdn-cms.f-static.net/uploads/4412570/normal_604029e119e09.pdf
    • https://cdn.sqhk.co/wujakegu/fjjgcjf/barapotosorewofepijazob.pdf
    • http://komaxinatobofe.medianewsonline.com/liminal_thinking_review.pdf
    • http://kudonolenukiv.22web.org/give_an_example_of_inferential_statistics_in_healthcare.pdf
    • http://xukewatamom.22web.org/agneepath_full_movie_hd_free.pdf
    • https://cdn.sqhk.co/pujixefan/cylhcqe/296642047.pdf
    • https://cdn.sqhk.co/pafevola/p4ieLia/lozudebubafotegum.pdf
    • https://cdn.sqhk.co/posibovifiw/uiehbaF/calculer_augmentation_pourcentage_formule.pdf
    • https://cdn.sqhk.co/bamebuxi/dlehdgd/dream_defenders_sunday_school.pdf
    • https://cdn.sqhk.co/josedinis/fhagegg/rey_skywalker_yellow_lightsaber_toy.pdf
    • https://cdn.sqhk.co/folikulezig/dU6l3LI/marketplace_appeals_number.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0793e221-2e7e-4176-aae8-4ff4b75d8f7a.filesusr.com/ugd/64bd79_8e3239624d474cada8a4763743beefb9.pdf?index=true
    • http://mapodivopabo.rf.gd/dajugituxomedukufo.pdf
    • http://kabumosubeno.epizy.com/blood_type_o_negative_diet_food_list.pdf
    • http://nekelaxowe.atwebpages.com/different_breeds_of_sheep_and_their_characteristics.pdf
    • https://1416a32c-f91c-4ec3-9c10-bfdf610c7df7.filesusr.com/ugd/76de1a_c8fd883ac7a242f48da263c7263971b6.pdf?index=true
    • http://fokogemuzaraw.epizy.com/53180551689.pdf
    • https://cf0d0a92-5201-445c-b3bf-06a924cdb482.filesusr.com/ugd/3254bf_067ff462ace84c048713bfc540462054.pdf?index=true
    • https://7aff118d-26f6-4d76-9bc9-1838009e7274.filesusr.com/ugd/f80014_e08225050ee04d808c671e40c95fe7bd.pdf?index=true
    • https://a0bbd489-bf03-48a0-8e93-88abd0751e5b.filesusr.com/ugd/370ea2_46ef15cc28d54f72a71aa687f1123998.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117f8.bin
7799bc4baf54723f5e572fbe3981ba711856d03c158ba5a485cdf9330e510955		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117F8 5832 bytes
font_01_sfnt_off00012baa.bin
3ad3421643107fe07e6f52e9849d5a81b470faa576c46bc14e33d8e7ea62da29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAA 12020 bytes
font_02_sfnt_off000154b5.bin
3a87a2a80cb0740ff7ad33dbd9b35031d90241dfccc5ab96a3d2c3133af9c3ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x154B5 16096 bytes

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