Malicious PDF — malware analysis report

Static analysis result for SHA-256 c373bffd71e04932…

MALICIOUS

PDF

63.9 KB Created: 2020-12-11 18:38:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 2b5add6abcd64a686a307d9f974ac96a SHA-1: ebeea86c7d104078d9e7e31d33c92261fc7d4913 SHA-256: c373bffd71e0493246dc03e150f312d6313acbd739b26750f8e97ce4bc049465
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://cctraff.ru/aws?utm_term=bebe+bapu+song'. It also exhibits a PDF link farm behavior, embedding numerous external PDF links, with 'https://s3.amazonaws.com/tabobujimo/57431972623.pdf' being the first identified. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a phishing or trojan-like intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://cctraff.ru/aws?utm_term=bebe+bapu+song In PDF document text
    • https://rukuzidin.weebly.com/uploads/1/3/4/5/134517246/fce5a9.pdfIn PDF document text
    • https://bivesazi.weebly.com/uploads/1/3/4/6/134652180/fufur.pdfIn PDF document text
    • https://dosowaworizur.weebly.com/uploads/1/3/4/6/134688898/bunewukatizevu_tuzoxizas_torepemomir_rexuvivit.pdfIn PDF document text
    • https://tilawebaxipas.weebly.com/uploads/1/3/4/5/134576196/nimiwudiwok_favomoximeti_tetuw.pdfIn PDF document text
    • https://zadopelujon.weebly.com/uploads/1/3/4/8/134884154/xibiwisupibil.pdfIn PDF document text
    • https://kenodijegubiv.weebly.com/uploads/1/3/4/5/134501598/d153bd2b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/57431972623.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5523bd26ff1194f913b76/t/5fc5ee493c6ccf69f32bee33/1606807127499/lee_county_high_school_football.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5533cd26ff1194f914669/t/5fd02f7fa946005758756ccf/1607479168117/20611530836.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2aac9f9866f3fd2df98d3/t/5fc692cca97599144edec357/1606849229879/minecraft_2020_game_video.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/kevurafuzig.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce1c01cd8500165ad4adc1/t/5fd10e7b2aef7644cc586688/1607536251511/fast_launcher_android.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/93870744386.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/nsw_teachers_accreditation_maintenance_report.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/endnote_cite_guideline.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_off0000b611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB611 5048 bytes
SHA-256: c48041ff314ce9b568ac66845f9c5ee9bb78b58a2f06aed77f3cd7931b8b8491
font_01_sfnt_off0000c753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC753 2448 bytes
SHA-256: 0eff0db62ed07d0c3430a4817bce0150d366f2139d174dd9c449e3ec3af4a4fd
font_02_sfnt_off0000d1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F5 9568 bytes
SHA-256: 4169a94251eae4f7ad258e61e0b2b8a088ea07602991640cb8219056a0a1d269

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