Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a6753e71e387d9e…

MALICIOUS

PDF

97.6 KB Created: 2021-03-11 21:39:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5cd4e35c05550403146b72d13d432929 SHA-1: 44e6129d1fc97f3457808f2ef1b509e41a79f899 SHA-256: 9a6753e71e387d9e25b40a17b675490f47b9c3664fde98dc0ce72d7d6e4e5495
184 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to disposable domains and redirectors known to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were extracted, the link farm and redirector behavior are strong indicators of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than 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.
  • 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://crophysi.ru/aws?utm_term=ensayo+de+prueba+sapo+y+sepo+un+a%25C3%25B1o+entero In PDF document text
    • https://cdn.sqhk.co/vabedesi/jhkyuia/38970704371.pdfIn PDF document text
    • http://tobufupevujuma.mygamesonline.org/kitagubamaratizoninazuv.pdfIn PDF document text
    • http://sufulilutidake.mypressonline.com/par_quoi_peut_on_remplacer_la_creme_liquide_dans_un_gateau.pdfIn PDF document text
    • http://kipiluzebeguluj.iblogger.org/29626654481.pdfIn PDF document text
    • http://kawlites.online/83413110585hhv6r.pdfIn PDF document text
    • https://cdn.sqhk.co/zenekukera/bQoic2O/dwight_schrute_costume_baby.pdfIn PDF document text
    • http://indital.fun/husqvarna_viking_sewing_machine_h_class_e10d2vif.pdfIn PDF document text
    • http://xufededubumavif.scienceontheweb.net/19873507285.pdfIn PDF document text
    • https://cdn.sqhk.co/gujuvizaja/ihjrV74/pottery_creations_shop.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/f743fedf-1834-419d-a2dc-fd7f187135c7/how_to_turn_graco_nautilus_into_backless_booster.pdfIn PDF document text
    • http://sipanokule.onlinewebshop.net/blackstone_fortress_40k_rules.pdfIn PDF document text
    • http://nawugem.epizy.com/form_for_loan_agreement_between_friends.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ead4e1b-e0d7-4b52-8f70-f6fa7b6db523/20042658450.pdfIn PDF document text
    • http://diwisowaf.rf.gd/bunn_axiom_coffee_maker_troubleshooting.pdfIn PDF document text
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_313ffa620d8a41d3ac00f36fe6f3a40c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ecf7d7a-1fc2-43c5-9d45-17fe06e7064b/analise_livro_memorias_postumas_brs_cubas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1028b88-8c2e-4c7c-82fc-4b4243ee1f9a/sifolup.pdfIn PDF document text
    • http://xemunebo.atwebpages.com/ap_by_john_updike_symbolism.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b86c75c5-77f7-48cf-9c96-a4740045297a/78096177991.pdfIn PDF document text
    • https://356bbf58-84af-4bff-99a9-d03346e46411.filesusr.com/ugd/b5472a_1822ca13f4e34a37adb49b71554efd35.pdf?index=trueIn 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_off00013a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A09 5332 bytes
SHA-256: c5ed43357a6b10032b3191c1c5c41cbd9a07392e1bb9907177b02a5325b321eb
font_01_sfnt_off00014bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BF9 13272 bytes
SHA-256: 22e418d1f3ef2f500c24be977b7a1c0eed43099d4d30e85a9e2f30637f2724ef

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