Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d366ed76b03dc8…

MALICIOUS

PDF

67.9 KB Created: 2021-02-18 12:03:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: cecca210a215dcf3f66a216fed17f58b SHA-1: 403ceba10c0f3f04b7c7ada4fda1cd8f0351e0ec SHA-256: c4d366ed76b03dc84f8773747a7b9918fbeed2ba7b8f68de6f9a53df1d781514
192 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link and is flagged by multiple heuristics as malicious, including ML classification and ClamAV detection. The presence of a 'download button' heuristic suggests a lure to trick the user into clicking the malicious link. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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/123?utm_term=draw+the+circle+40+day+prayer+challenge+free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4473938/normal_6027c48113cb9.pdfIn PDF document text
    • https://cdn.sqhk.co/vusopukov/3q2iahf/love_story_movies_2019_by_vj_junior.pdfIn PDF document text
    • http://tamakar.xyz/nuwudozivakapebidididov4sftw.pdfIn PDF document text
    • https://cdn.sqhk.co/kevamubeminu/vZgcs7a/kingdom_amino_for_kingdom_hearts_wiki.pdfIn PDF document text
    • http://libertinemodels.com/ys_8_approval_guidehkuo9.pdfIn PDF document text
    • http://freefire-gifts.com/53505314123rd9ql.pdfIn PDF document text
    • http://misstourist.info/92784353514vjz1r.pdfIn PDF document text
    • https://cdn.sqhk.co/somufegojaru/BRQijDV/kuretuwezukuxegoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fujesotes.epizy.com/class_12_maths_matrix_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/girilifawuxi/link_to_whatsapp_in_jio_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/alabaster_heart_by_bethel_music.pdfIn PDF document text
    • http://mejuton.epizy.com/rakumizipuwixop.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/jopot.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/37260468182.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/53748872549.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/61095769480.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_off0000cc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2C 5660 bytes
SHA-256: 226f37231c873fd4e60992fdb8ad205426ef8c30d0e4932a4f1a42bac24dff6e
font_01_sfnt_off0000df9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9E 10200 bytes
SHA-256: 706df5adba1ce553709be14ee4f17a906a25d2d0013aa64f12c8af2a51f6c53e

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