Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0927eb100fdaa46…

MALICIOUS

PDF

73.1 KB Created: 2021-03-24 20:36:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97c5316c01b2e7680d179c928bcc018b SHA-1: dac6eb73ea225f17e44b7b89de978c57013cada3 SHA-256: c0927eb100fdaa46d216e56391a82f30335d1de0bc75484bf0c442c6816e38ec
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_LINK_FARM' indicates the document contains numerous external links, with one pointing to a potentially malicious URL. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://golowaki.ru/123?utm_term=sentence+fragment+run+on+worksheet+pdf
    • http://microbladingeyebrowsdallastx.com/93274316777afu9u.pdf
    • http://komarovskii.xyz/onyx_plus_satellite_radio_receiver_manualz5vuw.pdf
    • http://dkshlyap.ru/vararukebafuwajebafsv9c.pdf
    • http://copyright-infringement.business/grep_commands_in_unix17lrk.pdf
    • http://tertov.xyz/aloo_matar_ki_sabji68idr.pdf
    • http://getliterate.online/difidivunajonojivividi7b2sy.pdf
    • http://clientbluebadge.com/baxapajudedokanubimopudl39j.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/abefd8f7-53cc-435e-a7d8-88b7fb2601f9/59657918287.pdf
    • https://uploads.strikinglycdn.com/files/788b950d-7832-4297-bdf9-5c7927fe2027/massey_ferguson_165_loader_attachment.pdf
    • https://uploads.strikinglycdn.com/files/4d950f85-af3b-47b1-96d7-c44a7de75bf4/sazonibamavus.pdf
    • https://uploads.strikinglycdn.com/files/f3d4dcd1-f1e1-4039-94fa-071bd79e76b6/vba_code_in_excel_examples.pdf
    • http://pepererazi.rf.gd/takuxununekogipo.pdf
    • http://vutekumini.epizy.com/tawilis.pdf
    • https://uploads.strikinglycdn.com/files/909521c5-08ad-42ce-809e-3ca002013b7e/rebewazaniribuvekeluzuku.pdf
    • http://pitefabe.epizy.com/kavaxegamusenot.pdf
    • https://28ed73df-463f-41d7-bc87-4635118fd8e0.filesusr.com/ugd/74acc8_eccdad35fce64604a83578e4eb79cc4c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b3f61b78-0bdb-42d3-b6ff-8aa5e6fcf9ae/bajowozidawobaduf.pdf
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_07a7c12bdc9445bd825edbbd9eb40bfa.pdf?index=true
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_c9a33052fe5a49da92a06f7ecdde598f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/37745676-dc97-4abb-bccf-1bfaa7d77cd7/visual_basic_excel_programming_examples.pdf
    • https://uploads.strikinglycdn.com/files/1560f1da-2776-4858-b7cc-43579e77b805/euro_pro_sewing_machine_manual_9130c.pdf
    • http://lerobuzal.epizy.com/posutevitamudopavim.pdf
    • http://savekuf.rf.gd/a343f_transmission_manual.pdf
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0a8.bin
d1c5cbce9d4abceae3f2e9f5f97c1a63d06a54f232e1a625f2e3e048fff61c1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A8 5796 bytes
font_01_sfnt_off0000f459.bin
45933a2281cc95a4c48484f4c8720e3d521ccf85d09d6e56ce9386f82de8f711		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF459 10044 bytes

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