Malicious PDF — malware analysis report

Static analysis result for SHA-256 433ca71b8bf76a8c…

MALICIOUS

PDF

77.4 KB Created: 2021-05-07 14:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f6fab81b470797f281306029a24d06a0 SHA-1: fddc9af9c6be0fb2c366329494bf4d2c1c3fc72e SHA-256: 433ca71b8bf76a8cd5cfbe2804309024b0f548e61e3eefa3dd05fe37e8b57bef
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 hosted on disposable domains, suggesting a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs are the primary indicators of compromise, pointing to potentially malicious destinations.

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://xezojetit.ru/strik?utm_term=mastering+the+art+of+french+cooking+italiano+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402507/normal_603b5a71009c2.pdfIn PDF document text
    • https://wilexezixokesu.weebly.com/uploads/1/3/4/7/134764798/eed6a0a9.pdfIn PDF document text
    • http://nomiwiturej.getenjoyment.net/ravoxiwinilobavo.pdfIn PDF document text
    • http://characduwe.space/nidajobakalevuviximovi7e2rd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452382/normal_602115f8c4902.pdfIn PDF document text
    • http://tryraisins.club/39257912723846re.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449000/normal_606740254a978.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486765/normal_5ff4693205166.pdfIn PDF document text
    • https://gadebalemalun.weebly.com/uploads/1/3/4/4/134443756/liputejapugivilup.pdfIn PDF document text
    • http://logunesunoj.medianewsonline.com/aadhaar_data_update_correction_form_by_post.pdfIn PDF document text
    • https://kibanelamuvudu.weebly.com/uploads/1/3/0/9/130969844/vobupaxotelafenoluma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375339/normal_602babdac9264.pdfIn PDF document text
    • https://zusifupovososix.weebly.com/uploads/1/3/2/6/132680896/5959783.pdfIn PDF document text
    • http://sneakerspapa.store/canon_powershot_sx20is_lenses2879w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423442/normal_604fbb88f3e3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387810/normal_6042e6297933e.pdfIn PDF document text
    • http://physcoo.com/50790301725n31cn.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/4c1f5cbe-8f74-4766-b0b5-f42fedcc15d2/semipera.pdfIn PDF document text
    • http://wojibikifi.myartsonline.com/streaming_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5832d41-29b4-428a-9eda-c05e62b708b0/46258338016.pdfIn PDF document text
    • http://tobikinos.onlinewebshop.net/wimiwibuwedisolegudifufon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd129f5c-ba97-48ac-a222-fee7d6a4c1b3/noginiz.pdfIn PDF document text
    • http://rixibedi.onlinewebshop.net/boolean_algebra_questions_and_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae1ec56d-add1-437c-a11a-4b375fff1b5b/how_to_renew_state_id_nj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68a6e290-8d91-4561-99dc-84b09edfaec9/master_forge_electric_smoker_recipes.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_off0000efdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDB 5484 bytes
SHA-256: ad300135df4402b7807213aaede7316743a5b1e4be965d9f0a64b40955c27ded
font_01_sfnt_off0001028b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028B 11436 bytes
SHA-256: a97303a8629351b304e4c619827482c15872578a60763ff7f26dd0a8e99de520