Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b9dfa4898f3f9c1…

MALICIOUS

PDF

85.1 KB Created: 2021-03-20 20:36:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 9c4c4f25d4527876f6030f09452e8eb4 SHA-1: ae06fa17c657b9593724eb8e1ea922c73fd34a3f SHA-256: 4b9dfa4898f3f9c1a0c22d50156e6762de705a9e58e10a5b072b69c8094e256c
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used for SEO farms or to redirect users to malicious sites. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and heuristic firings strongly suggest an intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://midufefew.ru/wix?keyword=pan+pride+day PDF link annotation
    • http://lalikexitaxixix.getenjoyment.net/xefapovojarusakuzuzusaz.pdfIn PDF document text
    • http://leledup.mypressonline.com/15429692458.pdfIn PDF document text
    • http://vevufilusik.scienceontheweb.net/sunejaxorebozojotupefegob.pdfIn PDF document text
    • http://lotobajigufar.mywebcommunity.org/pizidisunuwiravisawidevi.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/35e79746-5c86-413c-a635-988ebedef418/left_behind_series_in_chronological_order.pdfIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/2_bank_marine_battery_charger_wiring_diagram.pdfIn PDF document text
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_4006142cc5054cee8182027f00536a82.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/40ddf872-f6bb-4e93-ace7-1790871dd548/how_do_you_start_a_pressure_cooker.pdfIn PDF document text
    • https://35479656-6a94-44d6-ac55-da507c14a2ae.filesusr.com/ugd/d68318_08143b69793e42a3b16315f07292961a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/legal_compliance_audit_report_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53627c9e-f4c2-4cba-9ccb-08118f28b019/what_is_a_strict_construction.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/38928380042.pdfIn PDF document text
    • https://39c3e2ba-dcb8-4bc0-9ed7-0058f02c59d5.filesusr.com/ugd/fd4c29_5809de96bb584990baa6dd51f1cd7812.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/08914f2f-799f-4ad5-9f7a-cd6f5a1eb153/roriwip.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/eagleton_what_is_literature.pdfIn PDF document text
    • https://s3.amazonaws.com/zulezov/77567528604.pdfIn PDF document text
    • https://a43ab9c2-5efb-4cee-ac06-b782a0f5e207.filesusr.com/ugd/4826f5_13d69bb2640343e9b3d844067ee98a81.pdf?index=trueIn PDF document text
    • https://37cc4ef3-276f-49d0-84f3-8bc08bbde6a9.filesusr.com/ugd/e4a5d4_c43f44f43a994a57b447de3ba988477e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e368cbac-6065-4a22-a35a-8a8d011c19e0/rulijasajejada.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/black_and_white_crib_sheets_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/pujomebawosusomatimaguzo.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/ashes_of_oahu_pc.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_off00010f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2B 4844 bytes
SHA-256: 7984c5643c4ffacd66bfe8dedcdb0e84d566848d69c8c88fe66b3c5a8007aec8
font_01_sfnt_off00011fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBE 11700 bytes
SHA-256: fd6d5e05926ac0d52050965d87d7d1fe2877c9f5f7db6abd0de072aa44232887

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