Malicious PDF — malware analysis report

Static analysis result for SHA-256 a81ce935919e2a90…

MALICIOUS

PDF

81.5 KB Created: 2021-03-30 08:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ae1e4b970298e7b2f25b49660f5577ea SHA-1: 58244be171d949d788a887bf305144bbe0594961 SHA-256: a81ce935919e2a90bb5517057ee02a34c4ab9ee34f66997ec5970362c1976c1b
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, many of which are suspicious or unknown, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

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://nipisod.ru/wix?keyword=how+to+read+a+seismogram+worksheet PDF link annotation
    • http://rivepozepuxar.mywebcommunity.org/91129854381.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374545/normal_605c622eeefee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377662/normal_60369872a2384.pdfIn PDF document text
    • http://kizunawinim.getenjoyment.net/95731459720.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480744/normal_6013c72ec93ed.pdfIn PDF document text
    • http://vinnipoh.space/31128128829ghku7.pdfIn PDF document text
    • http://fudoviwil.mywebcommunity.org/vozudesuwexeki.pdfIn PDF document text
    • http://springtea.space/el_amor_en_tiempos_de_colera_filmrz0sv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453342/normal_606241e5b6215.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/6f945c3c-33c4-4b3e-b09b-797616a332c5/directv_genie_red_light_blinking.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/20687015055.pdfIn PDF document text
    • https://5d3a357a-25b2-4459-9cd8-210b235f7b36.filesusr.com/ugd/45e30f_62e62d351cb64d939793cacbe9300aab.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fivebo/the_wrath_and_the_dawn_book_read_online.pdfIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/arizona_cardinals_injury_report_week_8.pdfIn PDF document text
    • https://5c9c3928-af7d-4195-9e43-9647d7263c15.filesusr.com/ugd/508998_6a5e02fa69b94e51a93a092ad764eb2e.pdf?index=trueIn PDF document text
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_68a6fb5f5e0440488c52dc6ccf13e658.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/timeziso/68021731627.pdfIn PDF document text
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_29e7d4bce1a041de85db23eab16c854f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/speed_of_trust_cards.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcd43c95-8d59-4222-a683-fb8806657375/pikigoduzukekin.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB4 5324 bytes
SHA-256: 969e55280f4367998a823358c01109e36af0580ba6d86e34f201ca798b1085c2
font_01_sfnt_off0000fdb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB2 10920 bytes
SHA-256: 6b335c794637c59fac3cf8feafa59925f2af5bef84f9300b5d263f9b52619ca9
font_02_sfnt_off00012309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12309 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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