Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b87ae394b98f3d5…

MALICIOUS

PDF

72.4 KB Created: 2021-01-31 22:08:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 6082d128be55af056c2d7f81294a8af7 SHA-1: 37b2bc40a28dc8a642b76e88b6c6bfbc18107b78 SHA-256: 7b87ae394b98f3d5678cbb5eb084fe47bbdd7aa63dcae9c42fd89bc9a6918687
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/123?utm_term=stealth+cam+card+reader+for+iphone'. This URL is likely used to deliver a malicious payload or phish for credentials. The ML classifier also strongly flagged this PDF as malicious. Although no scripts were explicitly extracted, the PDF structure and the malicious URL suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://yafferge.ru/123?utm_term=stealth+cam+card+reader+for+iphone In PDF document text
    • https://static.s123-cdn-static.com/uploads/4388407/normal_5fc88bcc3f38f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426955/normal_5ffba3ccf3d59.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473640/normal_5ff5d121cd0da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452861/normal_6004ed211b1fc.pdfIn PDF document text
    • http://interplast.ru/649773476310orya.pdfIn PDF document text
    • http://milanbeachs.space/32bm2sq.pdfIn PDF document text
    • http://twoup-viktoria.online/poniva4hdtn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422637/normal_5fe4f6861e861.pdfIn PDF document text
    • http://losmopaka.site/abrsm_grade_5_violin_exam_piecesik0zw.pdfIn PDF document text
    • http://216tilford.com/sample_narrative_report_on_earthquake_drill_2019fee17.pdfIn PDF document text
    • http://lightly.store/sukenhlf45.pdfIn PDF document text
    • http://load-bcp.com/are_water_parks_open_in_wildwood_njshufl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://vobisobopimab.epizy.com/free_invitations_templates_birthday.pdfIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/spy_camera_wifi_android.pdfIn PDF document text
    • http://jigosip.epizy.com/80025625092.pdfIn PDF document text
    • http://zumukitukojus.epizy.com/qualified_and_unqualified_audit_report_meaning.pdfIn PDF document text
    • http://tebokemirutexus.rf.gd/information_on_anthrax_bioterrorism.pdfIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/fedixuxepurama.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_off0000d048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD048 5108 bytes
SHA-256: cf583e96d71d8e6d1cd41a6ed9930184792874bdcb3ed1f05eedb26933a8764a
font_01_sfnt_off0000e171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE171 10820 bytes
SHA-256: 238f6894f6fc2494883c2ec4c937e59db042ce81ecd161f66db99cb5c8dc1ada
font_02_sfnt_off00010684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10684 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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