Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9c2b70aa5aaa590…

MALICIOUS

PDF

80.1 KB Created: 2021-03-19 22:16:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b12284d76a9966aca589de943effec56 SHA-1: 08a1f498cd217a210bc478da1b2aed6f1377154b SHA-256: d9c2b70aa5aaa59002d376f9032e6c3eb8e434c9b7413dc66b1167e465e90e69
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly-hosted PDFs and SEO redirectors, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and external link farm heuristics point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://soxebez.ru/wix?keyword=alkene+reactions+practice+problems+with+answers PDF link annotation
    • https://vipeketiduwe.weebly.com/uploads/1/3/1/6/131636725/fofugosalud-gowig-lixafevubilevil-vawagubimanivin.pdfIn PDF document text
    • http://pinegobojefo.getenjoyment.net/fifabet.pdfIn PDF document text
    • http://lienforkid.com/emoney_advisor_customer_serviceqak9w.pdfIn PDF document text
    • https://puxezemugip.weebly.com/uploads/1/3/4/3/134311794/pewipun.pdfIn PDF document text
    • https://soferivajateru.weebly.com/uploads/1/3/4/6/134650686/lojimetaxukozedifuf.pdfIn PDF document text
    • https://wefogazasu.weebly.com/uploads/1/3/4/8/134880183/xaregexurokelen-zuzimage-timolixuxebe.pdfIn PDF document text
    • http://wizapivizesib.mygamesonline.org/23717050947.pdfIn PDF document text
    • http://zisuroto.mygamesonline.org/what_is_the_nypd_physical_test.pdfIn PDF document text
    • https://romidawuro.weebly.com/uploads/1/3/2/7/132712233/bosemabovu.pdfIn PDF document text
    • https://nidabiweni.weebly.com/uploads/1/3/4/8/134865500/funibuk.pdfIn PDF document text
    • http://urolog.xyz/724406751944lqkj.pdfIn PDF document text
    • http://merishwheelrecords.com/how_to_program_time_warner_remote_to_tv_rc1228fyqs.pdfIn PDF document text
    • https://derivasip.weebly.com/uploads/1/3/1/4/131407068/xojefibudi.pdfIn PDF document text
    • https://bopexetijajab.weebly.com/uploads/1/3/1/4/131411078/xonexodebilifu.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
    • https://s3.amazonaws.com/dosalapasenow/newspaper_report_template_online.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/get_apk_market_app_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/cairngorm_ski_report_today.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/zokevosi.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/37352286914.pdfIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/biography_template_for_students.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/router_guide_bearing.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/savowadopobokumegawi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD711 5244 bytes
SHA-256: 15381550b5e8e8927a105c1e37177e95e0064613f106b29690d88e32bb930313
font_01_sfnt_off0000e8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AF 10396 bytes
SHA-256: c619915e78df02b5e08ecd4ee421723fd784ba23e6cd0e6b2ce1d376de8d8473
font_02_sfnt_off00010c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C53 16312 bytes
SHA-256: bf8f9ece8d9d74ce2d7a98a07ee1bb8f4056faf702b3b1702118181e85f1b939
font_03_sfnt_off000121de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DE 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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