Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e75fb4b6f45a14c…

MALICIOUS

PDF

90.0 KB Created: 2021-04-18 21:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 74c28a9e85c2e0c7b68e6744cf87ac58 SHA-1: 16ae8b35112c23099782f84269b0cc19101e8405 SHA-256: 4e75fb4b6f45a14cd50a38783fae8f648d4a25b56aab626cc93b94ce5f59da36
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. While the document body is heavily obfuscated and unreadable, the presence of a malicious URL and the ClamAV detection suggest a phishing or malware distribution attempt. No scripts were extracted, but the malicious URL is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?utm_term=chinese+learning+books+for+beginners+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4478927/normal_5ff5bb321556e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474977/normal_5ff3f67eaeb9f.pdfIn PDF document text
    • http://bibopasaxuvibu.mypressonline.com/35043215802.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477400/normal_601eded025043.pdfIn PDF document text
    • http://jopagozopive.medianewsonline.com/1183009465.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427300/normal_60244caf24917.pdfIn PDF document text
    • http://jaralet.getenjoyment.net/jezup.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/d3646c36-3dc4-4a9b-8ee4-a5c43899cc48/how_to_improve_strategic_human_resource_management.pdfIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/faviwudamafe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c25bbaa5-4cfb-4d57-9f5d-f75cb9450c79/myers_briggs_types_rare.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/86497971132.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/50599612240.pdfIn PDF document text
    • http://xepuzakudera.atwebpages.com/46507218707.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/1307217457.pdfIn PDF document text
    • http://retiziwo.myartsonline.com/petuwujejumafevibonetosi.pdfIn PDF document text
    • https://s3.amazonaws.com/wolawatin/70391730488.pdfIn PDF document text
    • http://lusajafimaneru.myartsonline.com/unit_6_geometric_proof_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/aec_full_form_in_computer.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/buxipoko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdcb709e-af1d-49fa-bc35-cad29bbc3824/what_is_the_full_form_of_desktop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77bb73a1-f9bd-4b7b-99c8-118429044b77/18379203784.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/bissell_little_green_spot_cleaner_solution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bb91cf0-a8b5-4870-8a23-62dd5f89aeeb/bosch_500_series_washer_and_dryer_stacking_kit.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/44884037614.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/makoferiwanalanezi.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_off000104e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E2 8368 bytes
SHA-256: 645c693405da8b81f7280b83490f7bdb8dd887759fff9b8f0e48dcbef324c8c6
font_01_sfnt_off0001213d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213D 5412 bytes
SHA-256: c240774c03fbe1329f430657a4a60bd6bb22f1802b96013e9a6fc491efe4dd5b
font_02_sfnt_off00013392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13392 10804 bytes
SHA-256: e583877e67c2faad3c620a14610fd290745870dfc4a72020aaea57290c5956ec