Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c171eb75a71dfca…

MALICIOUS

PDF

67.4 KB Created: 2021-03-02 10:39:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2f769677dd22f035fcdd4366edc2d1aa SHA-1: a4942a437ec6f3a37c9eec4461fd9bd3d2b311e7 SHA-256: 6c171eb75a71dfcad88fae0c90b6fa0de1545ab1ac4fd35cf7e0307004c5e478
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document delivery, likely via spearphishing.

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
  • 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://baarspo.ru/123?utm_term=is+a%252B+certification+worth+it+2019 PDF link annotation
    • http://xiruzox.mygamesonline.org/how_to_use_beurer_wrist_blood_pressure_monitor.pdfIn PDF document text
    • http://jurojegame.getenjoyment.net/macbeth_and_the_apparitions_act_4_scene_1_worksheet_answers.pdfIn PDF document text
    • https://didegesub.weebly.com/uploads/1/3/2/6/132681352/lumusovefit_nojepimozugatax_bixadusuxuveru.pdfIn PDF document text
    • http://vvinorama.website/25333263769526ei.pdfIn PDF document text
    • https://boliminukedakos.weebly.com/uploads/1/3/4/4/134494229/9559938.pdfIn PDF document text
    • http://ig-soft-team.com/unit_1_basic_biological_principles_answer_keyipfak.pdfIn PDF document text
    • https://cdn.sqhk.co/xuluriwu/oidBo3Z/52217153906.pdfIn PDF document text
    • http://presalle.xyz/356662422h6tgx.pdfIn PDF document text
    • http://dkblogin-de.best/measuring_units_worksheet_answers_5th_grade383w1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/how_to_answer_law_questions_using_irac.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/28672107840.pdfIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/zemabudibegalexovibofimuj.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/18115600983.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/chembarathipoo_malayalam_movie.pdfIn PDF document text
    • http://kepagewav.atwebpages.com/how_to_pair_jlab_neon_headphones.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/99962462928.pdfIn PDF document text
    • http://vesedakowata.onlinewebshop.net/casio_g_shock_ga_1000_strap.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/depejodipopojeg.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/22644254676.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_off0000cad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD9 5448 bytes
SHA-256: c808a5c3181720860664480a4512441fbb29b800abb77b30edf9448a3fa288b1
font_01_sfnt_off0000dd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD71 10332 bytes
SHA-256: a0da61f09b798696b5e299ebf79d1c92a0c5ffb961f75f2995987f2e2db02de1

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