Malicious PDF — malware analysis report

Static analysis result for SHA-256 3824ea86d552866f…

MALICIOUS

PDF

76.8 KB Created: 2021-05-25 16:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 85d9b255725b3094fd10ade8c975eab1 SHA-1: 4a89d1a62bc3055023cda02f7aaf1bad39fcce35 SHA-256: 3824ea86d552866faaa6d5c55d44abf3fbfff3b41720f3931466c004f5ecb7d1
186 Risk Score

Malware Insights

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

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The document body, though partially corrupted, indicates a lure related to obtaining property titles in Peru, which is then used to populate SEO-optimized links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jottigo.ru/wb?keyword=como%20obtener%20titulo%20de%20propiedad%20de%20un%20terreno%20en%20peru PDF link annotation
    • https://samomalekadoj.weebly.com/uploads/1/3/1/4/131438786/pexedotarelo.pdfIn PDF document text
    • https://buserakufazuwus.weebly.com/uploads/1/3/4/0/134097478/d11cf.pdfIn PDF document text
    • https://rezigetofetima.weebly.com/uploads/1/3/1/1/131163738/dogezideputamis.pdfIn PDF document text
    • https://vexinafofonazes.weebly.com/uploads/1/3/1/8/131871992/2844389.pdfIn PDF document text
    • https://lulitetuxopibol.weebly.com/uploads/1/3/1/1/131164377/8853219.pdfIn PDF document text
    • https://bunadijora.weebly.com/uploads/1/3/4/4/134432215/nomejavuveru.pdfIn PDF document text
    • https://jedidaril.weebly.com/uploads/1/3/4/6/134687024/5314224.pdfIn PDF document text
    • https://bepefuligifeval.weebly.com/uploads/1/3/5/9/135981888/rugapigavojas.pdfIn PDF document text
    • https://rowexajezer.weebly.com/uploads/1/3/0/7/130776500/639760ab212f.pdfIn PDF document text
    • https://vawovuwowoxug.weebly.com/uploads/1/3/4/0/134040368/xetawavoruwusiriwo.pdfIn PDF document text
    • https://rirupalolidofe.weebly.com/uploads/1/3/4/6/134601765/24ddc0f4.pdfIn PDF document text
    • https://wizitizisib.weebly.com/uploads/1/3/4/3/134361222/2276050.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410416/normal_602146198a69a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390382/normal_5fdae88e1ff50.pdfIn PDF document text
    • https://dupomosukafe.weebly.com/uploads/1/3/5/3/135387566/girene.pdfIn PDF document text
    • https://subokolabipu.weebly.com/uploads/1/3/2/3/132303028/waridamubo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447089/normal_60148f1b5ceda.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/ee1b3310-ef83-4343-a771-78ea1720db6a/47579573452.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/14245066441.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/beef_flank_steak_nutrition_information.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/kudezebobomebu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d770605b-a941-44d9-b945-ca35c3cf51a2/2007_ford_explorer_sport_trac_repair_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/tazisum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1737a366-827f-4fa7-807f-cd9213f498d7/zidasawavirakopexudo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77cb6477-0d6b-4e25-ae7c-155ee1a15d61/6901272501.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_off0000ec4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4B 4972 bytes
SHA-256: 62ebf52377a47b33e5826351c905fbbb45e2abc30d89ef83fc81b9584d432cd9
font_01_sfnt_off0000fd0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0A 11704 bytes
SHA-256: d2451614318ba1cbdf0a952d2dfea22e7909f99fd357e0d2a7adc320a0a57f22