Malicious PDF — malware analysis report

Static analysis result for SHA-256 8953d68d3e7c2c79…

MALICIOUS

PDF

91.4 KB Created: 2021-03-05 22:52:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6219585b35ec416bdd8a50c15cfd0a02 SHA-1: 8f06b40fab9169c108861b54632f0e95f83f5f77 SHA-256: 8953d68d3e7c2c7981c1e2c9a50e44c78c51e49ea41f3cf8bca7c5ed0f433be4
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or phishing operation. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/strik?utm_term=what+is+criminal+injustice PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447086/normal_602dac2ec94bd.pdfIn PDF document text
    • http://extra-fon.ru/3248176622731mcj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447903/normal_603358fa9cbdb.pdfIn PDF document text
    • http://optamorem.com/gupugisipejj8msq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465127/normal_603d5bebd6170.pdfIn PDF document text
    • http://x-bionic.shop/razawetapizab8049v.pdfIn PDF document text
    • https://cdn.sqhk.co/lopijikuvi/xK6jdhb/all_movies_on_hulu_right_now.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486971/normal_5fdaae0518b36.pdfIn PDF document text
    • https://cdn.sqhk.co/sawomunuj/jigejGT/31060049285.pdfIn PDF document text
    • http://creamwalls.online/4011664093137au0.pdfIn PDF document text
    • http://mybatut.store/26745504739a69mm.pdfIn PDF document text
    • http://insuranceautousa.com/bird_song_notification_soundcbwxs.pdfIn PDF document text
    • http://kpovli.ru/how_to_flush_gallbladder_and_liverq0j2j.pdfIn PDF document text
    • https://cdn.sqhk.co/wigalefu/ggmoKpD/35654981938.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ecf8b3bd-8201-449f-a39c-156acd88681e.filesusr.com/ugd/97634b_dc2d77d40e344640be065351f1fa2122.pdf?index=trueIn PDF document text
    • https://7ae52be2-ba3c-41fb-8935-29281088223e.filesusr.com/ugd/affaa6_37f7ddad58f441fb95186ae3d73e3d2e.pdf?index=trueIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_ba1a3c4f2b4944a4ad5ce1aa928e001e.pdf?index=trueIn PDF document text
    • https://42e65457-ec34-4553-8979-78b6e302f774.filesusr.com/ugd/f1976d_f93ddc2d2a184a0d93137e2b13a1cc2f.pdf?index=trueIn PDF document text
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_56fd135b5883473a9c67ae87e69b5ceb.pdf?index=trueIn PDF document text
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_585e14862d5140d7a66b94372fe50e5d.pdf?index=trueIn PDF document text
    • https://5b949be5-44ef-49af-96c7-0ebaa8fe632e.filesusr.com/ugd/3402b1_8c0839a84d7d4764b690dd3fedf71a45.pdf?index=trueIn PDF document text
    • https://c06d174a-caca-4ab2-b5a0-4525cd3135d4.filesusr.com/ugd/856cea_a2cdf025bcf7451fa7ae4e88e524e63c.pdf?index=trueIn 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_off000128fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FC 5128 bytes
SHA-256: 15341c1f8c60fb65c25218caaabda172f27f53ac1ee0738adcbc37e28193cbda
font_01_sfnt_off00013a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A4D 11272 bytes
SHA-256: 74843ee46b79d2099e4b68f0a34981ac258b00c5c1375006f5cf19aebf426ecd