Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0f554d4998b4f03…

MALICIOUS

PDF

77.2 KB Created: 2021-05-13 03:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 80805e38392f2b58886c37e6bf84e9ad SHA-1: 67b97ad8ea061a9c36b109e169ba6c29eef988d8 SHA-256: f0f554d4998b4f03b9213ce7aeeef995a9c925aec713cbea6b1d73120510af22
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://nipisod.ru/strik?utm_term=basic+questions+asked+in+electrical+interview PDF link annotation
    • https://duparumiwope.weebly.com/uploads/1/3/4/7/134707207/5368499.pdfIn PDF document text
    • https://zepemotofilizag.weebly.com/uploads/1/3/5/3/135399015/ziginakegapomajisi.pdfIn PDF document text
    • https://belonimilulufaf.weebly.com/uploads/1/3/4/4/134403367/rapux-kememewi.pdfIn PDF document text
    • http://ru-payment.casa/49316589324yp0mr.pdfIn PDF document text
    • https://budigalaxob.weebly.com/uploads/1/3/5/3/135313384/f2dd3e135343166.pdfIn PDF document text
    • https://sugelazo.weebly.com/uploads/1/3/4/7/134767002/monofikuwiwu-nugir.pdfIn PDF document text
    • http://hq-cleartv.info/the_cat_in_the_hat_book_age_rangekiron.pdfIn PDF document text
    • https://tibuvaji.weebly.com/uploads/1/3/4/7/134720571/3513102.pdfIn PDF document text
    • http://axecheat7.xyz/vampire_diaries_cast_ages_202041bj2.pdfIn PDF document text
    • http://koparikamoze.scienceontheweb.net/55384707844.pdfIn PDF document text
    • http://biomanua.website/the_white_donkey_book_report7k44r.pdfIn PDF document text
    • https://mixusabap.weebly.com/uploads/1/3/4/0/134096097/bisasibuvafuxudosej.pdfIn PDF document text
    • https://porelananov.weebly.com/uploads/1/3/0/7/130775759/86a877.pdfIn PDF document text
    • http://trokot-shtorki.online/riparedigunkwbsj.pdfIn PDF document text
    • https://kowenijog.weebly.com/uploads/1/3/4/0/134096242/1262006.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/gusule/ikea_kallax_instructions_25_cubes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad89ea1f-19b5-4414-81d2-0a3b2feb28d3/the_road_not_taken_summary_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/resabomibogodaw/valentine_s_day_worksheets_kindergarten.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2c6cbdb-6218-4c7c-a5c4-795155b03235/why_dehumidifier_not_collecting_water.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/60671097271.pdfIn PDF document text
    • https://s3.amazonaws.com/tomaxade/basic_terms_of_accounting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f86b4b6b-0d23-4eea-9899-fc51761be434/28988542493.pdfIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/cafetera_dolce_gusto_circolo_manual.pdfIn PDF document text
    • http://rorazizaxaf.atwebpages.com/93819535436.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf2b13cf-7855-4a8b-8246-8691241a1bea/52706348783.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/159efabf-2442-485f-8c3d-e06856bcc41b/56175078263.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_off0000ee8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8D 5324 bytes
SHA-256: 57b539a6b4ecb1cf55cd5db9bb93a0cf064935dd2162de3f6fe2696115b5bdff
font_01_sfnt_off000100c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C9 11220 bytes
SHA-256: efa9501980672cba1398a7cf971e99cb519576d8f553e254a37f2eb588efa905