Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a5dd22f0ee224d5…

MALICIOUS

PDF

79.9 KB Created: 2021-05-20 02:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: b7f7d77ab68d5c89d04ee87a0606fb93 SHA-1: 25e9111bc5169c723af43acc8e4920c57a6db74b SHA-256: 4a5dd22f0ee224d5c9fbe56e35ea098b5ee90abb796cb3206ab3af25dc256e2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or SEO poisoning tactic. The primary malicious URL identified is https://xajibur.ru/strik?utm_term=the+kissing+booth+2+marco+quotes, which is likely used to distribute further payloads or phish users. No scripts were extracted, but the PDF structure and link farm heuristic strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xajibur.ru/strik?utm_term=the+kissing+booth+2+marco+quotes PDF link annotation
    • https://pifavakibapel.weebly.com/uploads/1/3/0/8/130814246/nexesabujukapuliwik.pdfIn PDF document text
    • https://fuvunubeliratak.weebly.com/uploads/1/3/4/6/134610803/7569457.pdfIn PDF document text
    • https://wivilunox.weebly.com/uploads/1/3/1/4/131453894/3150369.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458837/normal_5ff69157371e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418991/normal_5fd10ccd9a0ed.pdfIn PDF document text
    • https://zojevobe.weebly.com/uploads/1/3/1/1/131163992/mazoloxexexazax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490264/normal_605fa45422191.pdfIn PDF document text
    • https://lizelizana.weebly.com/uploads/1/3/1/4/131409616/wexilasejikuz.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/patotale/the_tale_of_peter_rabbit_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77919cb8-acbf-404c-81a3-af90c15519c6/childhoods_end_movie_1997_online.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/moschino_men_s_shoes_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/manistique_river_fishing_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ad64b04-3f6e-4d9e-9061-d6c5bffd7add/46195490420.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/48111193081.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/montgomery_ward_sewing_machine_model_30.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/kimitaguxupamen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e3a0624-0e82-408f-8ea9-71113d0fe4e0/74454187182.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b11e1706-70d5-403c-bfa7-10caa39bc562/60433117132.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09dd633e-1172-4805-b204-ed07fee04ebe/99442540890.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08bbe987-04f3-4522-90f9-6a42affe98c7/25802245138.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83f30e89-8539-446d-9422-51f7edf410d1/harrison_principles_of_internal_medicine_21st_edition_release_date.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/87874113427.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_off0000f94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94F 5592 bytes
SHA-256: b38f8f11a5debef1d7bd7e3609e7cd18877ff98d9be20fbbd64208f860d40058
font_01_sfnt_off00010c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C27 11304 bytes
SHA-256: 0ca371b786d0b80138192ae36d692cc0a8d08f8b3e98ee2267f8b8ba1ff4e8f7