Malicious PDF — malware analysis report

Static analysis result for SHA-256 bde72c871e313652…

MALICIOUS

PDF

73.9 KB Created: 2021-02-13 10:41:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9d78a0ab631efe01ad3c95ed09c846ed SHA-1: 07fefae6da9d3caeb3c51899102c6837730f88b0 SHA-256: bde72c871e3136524f4ec0d8dff0db6c6113e2a6ddb6b0508a65b8abe9d84128
184 Risk Score

Malware Insights

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

This PDF file was detected as malicious by multiple heuristics, including a critical finding for a link to known malicious redirector infrastructure. The embedded links, such as 'https://crophysi.ru/wix?keyword=otc+pain+medication+list+strongest+to+weakest', are designed to lead users to potentially harmful websites. The document's structure and embedded URLs suggest a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=otc+pain+medication+list+strongest+to+weakest In PDF document text
    • http://brumbum3.xyz/55071133753gpcrl.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/hdnY5gg/pobosadenipove.pdfIn PDF document text
    • http://soluzixod.66ghz.com/polar_coordinates_worksheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459326/normal_601723bf39c55.pdfIn PDF document text
    • http://domainlimax.xyz/pinball_space_cadet_androidc4926.pdfIn PDF document text
    • http://vquest.website/baby_bingo_template_free49nr2.pdfIn PDF document text
    • https://cdn.sqhk.co/tezasevimab/hghjaDf/bugenifosig.pdfIn PDF document text
    • http://kexejadupuna.66ghz.com/kupamifa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468537/normal_5ffde04db26f2.pdfIn PDF document text
    • http://teasmall.space/quit_claim_deed_pinellas_county_florida8vy4b.pdfIn PDF document text
    • https://cdn.sqhk.co/reretukida/XidgdF3/89543891716.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366313/normal_5fcd397134351.pdfIn PDF document text
    • http://delaem-sami.online/658992730386d3rf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://datadeb.epizy.com/6938696742.pdfIn PDF document text
    • http://dimonejoxu.rf.gd/rov_thailand_server_apk.pdfIn PDF document text
    • http://jojomuge.epizy.com/suraveromu.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/nosobovefeg.pdfIn PDF document text
    • http://nobufep.epizy.com/witifinasi.pdfIn PDF document text
    • http://jabujiwotase.epizy.com/towoganefofudivamupiwep.pdfIn PDF document text
    • http://ponuruv.rf.gd/soundcloud_playlist_zip.pdfIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/90149267023.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_off0000e482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE482 5576 bytes
SHA-256: 0ba0ddad9a75839d2f13f5cf6ca6c3610f3deed04e719ada2cc14b7cc12f1321
font_01_sfnt_off0000f774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF774 9992 bytes
SHA-256: 0c321517f466b61dee1b05b84989d3731d08005fde2228df50591ef639857659

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