Malicious PDF — malware analysis report

Static analysis result for SHA-256 71937f91ecda93d8…

MALICIOUS

PDF

78.1 KB Created: 2021-03-22 22:44:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fec28c91be3114c3d5e48e27362236d5 SHA-1: 959310a615855e434b88ff24961a6bc46d06356f SHA-256: 71937f91ecda93d8317bb1950f4038fe97bf4096a9e458f829c5dda7f020f3c4
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to suspicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/123?utm_term=bookmania+bold+free
    • http://dotixomovi.sportsontheweb.net/carol_ann_duffy_mean_time_collection.pdf
    • https://cdn.sqhk.co/xewafazuk/ijhM1iu/nikana_prime_riven.pdf
    • http://wofurasosezisax.mywebcommunity.org/59880759944.pdf
    • https://cdn.sqhk.co/dopiporajen/gggEihf/fiji_airways_check_refund_status.pdf
    • http://wazepewazivulil.mywebcommunity.org/bremen_musicians.pdf
    • http://bufezipuduxev.mywebcommunity.org/lezutodawupesajebarelules.pdf
    • http://wujejejifi.mygamesonline.org/wicca_a_year_and_a_day_free.pdf
    • https://cdn.sqhk.co/libibamudo/ifjgBrQ/jawilobun.pdf
    • http://xenojupu.mywebcommunity.org/campbell_biology_in_focus_ap_edition_1st_edition.pdf
    • http://gapilojazixo.getenjoyment.net/xazufizudexizosevada.pdf
    • http://delozofize.scienceontheweb.net/dukalokugubizuna.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_5183891e972c40c185c393f0fd1fc969.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b7a7260a-26c1-4e4e-b28b-ea8b949bbdb9/formato_para_hacer_plan_de_negocios.pdf
    • https://uploads.strikinglycdn.com/files/4867496e-cc53-43c0-bcca-7b19c8f19351/what_is_made_of_membranes_that_contain_chlorophyll.pdf
    • https://8c4778c4-ed17-4cf1-86f9-5448e21c5c15.filesusr.com/ugd/6da380_e9b5b73239e54a3f9c5ab828af6dff6a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/dcaf7861-8446-4746-aca4-5360d068bc7d/36345300551.pdf
    • https://uploads.strikinglycdn.com/files/5609ac47-0fae-449f-937d-9bc33e461579/what_is_interactive_voice_response_and_how_it_works.pdf
    • https://1e438cd7-6f3b-42ac-a97b-d13a75fa135b.filesusr.com/ugd/0c268c_145305e1e62f4eed8c3b397b2638da8d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/11a162da-0afa-48b9-bd08-c80f87769b44/what_causes_reading_fluency_problems.pdf
    • http://roveramo.atwebpages.com/ruxemonotidul.pdf
    • http://ritumogadoj.onlinewebshop.net/bcom_syllabus_ignou.pdf
    • http://raxegujanamefas.atwebpages.com/what_are_the_different_types_of_manufacturing_process.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddf7.bin
140dabb18289ab92cf9f3a3f1264ef521453d570a7d99a82d51752bbcb66ab82		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF7 5128 bytes
font_01_sfnt_off0000ef56.bin
5e7a1c0da90f3a656174811aaecbb695748a343f77a25937cb331511a9217567		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF56 11392 bytes
font_02_sfnt_off00011615.bin
e5245523bd71a78e06ca3300da63f55ad096e28dd8c1a5e83e138be64f7d0aee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11615 16084 bytes

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