Malicious PDF — malware analysis report

Static analysis result for SHA-256 887d3b3b74104107…

MALICIOUS

PDF

79.9 KB Created: 2021-06-11 10:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: ec78c05c695db68b13f05627d4087ce8 SHA-1: e45448b3daa81f19f076756e0e8f6871121ef7de SHA-256: 887d3b3b741041077bfc0e4720a3b66c8892bb5b5cd3c1a5f3252de5ab3bb420
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jacksth.ru/123?utm_term=secondary+math+module+1+sequences+answers PDF link annotation
    • https://radenomubadinor.weebly.com/uploads/1/3/4/1/134108668/zitenezalizufis.pdfIn PDF document text
    • https://vizazoxo.weebly.com/uploads/1/3/4/6/134600102/9535675.pdfIn PDF document text
    • https://firebawoba.weebly.com/uploads/1/3/4/6/134659507/5787883.pdfIn PDF document text
    • https://watinamubil.weebly.com/uploads/1/3/0/8/130813586/nezikazunuxuruzof.pdfIn PDF document text
    • https://tevitoretej.weebly.com/uploads/1/3/2/6/132680933/rolefat_fixifiwum_dunibej_sozenurane.pdfIn PDF document text
    • https://zepifuvuxetota.weebly.com/uploads/1/3/6/0/136095774/54f2485be6d1124.pdfIn PDF document text
    • https://gazevasodixobex.weebly.com/uploads/1/3/4/4/134437076/3718829.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/bd4835b0-30f8-41a7-bcf6-198e35779e5b/tesinugokirubetufuvaziw.pdfIn PDF document text
    • http://gejigavowule.pbworks.com/w/file/fetch/144914406/14341820089.pdfIn PDF document text
    • http://negekovav.pbworks.com/f/when_is_the_release_date_of_miraculous_ladybug_season_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17e11ec2-4328-4aef-9937-6a21f8662594/alpine_ktp-445u_car_amp.pdfIn PDF document text
    • http://mapaduzipi.pbworks.com/w/file/fetch/144603882/90004021453.pdfIn PDF document text
    • http://sojakun.pbworks.com/f/download_zuma_deluxe_full_crack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc39ab09-350f-4036-9a5f-22e796ff20bd/how_to_set_rca_clock_radio_manual.pdfIn PDF document text
    • http://nalujoxerisi.pbworks.com/f/bir_pletok_old_betawi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcaafe27-91ac-4e97-8318-ce3c5b20bf6d/14892252698.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7e85927-52c5-4032-8021-bb2497015901/does_kenwood_ddx371_have_bluetooth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3080e498-d3c2-4c49-9c73-5ac919620be1/xabudifefonujejam.pdfIn PDF document text
    • http://povelin.pbworks.com/f/remimakonilewalawed.pdfIn PDF document text
    • http://gipomebepate.pbworks.com/f/mojejitinixodu.pdfIn PDF document text
    • http://sejuworepow.pbworks.com/f/title_animation_after_effects_template_free_download.pdfIn PDF document text
    • http://mudowomuxexo.pbworks.com/f/transformers_3_full_movie_download_in_hindi_filmyzilla.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d765b9e7-f527-40e6-a504-f0db9b2a26a7/70430472185.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc9e6b18-ff98-4365-9aca-f68277a3d90b/blackberry_classic_q20_trng.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cddfc74a-e66e-4e92-9cde-3c34e7f12ef8/xejigokox.pdfIn PDF document text
    • https://flic.kr/p/d9XiIn 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_off0000f7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F6 5656 bytes
SHA-256: 330eedaa8d92bb793b1c5483aff6f9677306aa5c66574c60a1febf905dd89e47
font_01_sfnt_off00010b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2B 11388 bytes
SHA-256: 8ef26df04b2ffd932f684d0fd196a9a2ede941941d6192ac78625d2f3dd90bf4

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