Malicious PDF — malware analysis report

Static analysis result for SHA-256 43be667cf5430134…

MALICIOUS

PDF

154.2 KB Created: 2021-03-15 18:44:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 1a70187ce85551298b4dd088825879b1 SHA-1: 9db5ed881e7f0205e5e2921ac680ca41c28b3015 SHA-256: 43be667cf543013461a5eeaca10a093ddec163e7025af78464fd45789eb59c50
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a significant portion pointing to disposable hosting and exhibiting link farm characteristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of external URIs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest the document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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 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://fokemale.ru/strik?utm_term=derecho+romano+marta+morineau+iduarte+pdf+gratis PDF link annotation
    • http://youla-24.cc/silivuxobewetoruwuvijerjjqpr.pdfIn PDF document text
    • https://tekadepaja.weebly.com/uploads/1/3/4/3/134341299/sisepunulux-wagovuxasugitof-potuvol-kobufizek.pdfIn PDF document text
    • http://saleproducts.pro/jilasenifaw3yya.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448995/normal_6027782658a9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393635/normal_600caa10db1b1.pdfIn PDF document text
    • https://zuretajobujab.weebly.com/uploads/1/3/1/4/131483148/lowume-libepi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470537/normal_602f534f6dbfb.pdfIn PDF document text
    • https://bavobero.weebly.com/uploads/1/3/4/5/134585538/jopeg_foduguxogi_xogisivitifew_gadozadudar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495975/normal_6003bce91083b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487191/normal_602426ed8facb.pdfIn PDF document text
    • https://towowiwegopute.weebly.com/uploads/1/3/4/0/134019464/d64b34b622.pdfIn PDF document text
    • https://neripekotijoba.weebly.com/uploads/1/3/2/6/132681370/sozawukidet_rozumup_moxod_rujivedebasi.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/df109e6d-53b1-4759-a0fb-90f5d80e1595/clover_water_cooler_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7d53d36-b054-41b3-bcf9-5f09d1e4a5b8/types_of_cross_flow_heat_exchanger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af8c1671-0453-4715-abfa-861640496909/ap_calc_ab_2017_multiple_choice_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98aefdb1-0df2-4225-b603-e0dd10cf43f7/2148946002.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e28aa5b-eb1b-42db-839d-dd98c9f73c90/rita_mulcahy_pmp_exam_prep_9th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/413c01f4-b382-4c57-9368-55c68b984a29/woman_warrior_dc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6d82093-3db3-4e72-a6a3-4af5bab59a1e/asus_x205t_battery_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f4e6340-ddb8-48c7-ba0d-da83598c8e96/24_hours_in_a_day_quote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce72ad3c-af8e-4e47-bc64-f37cf0eb08ea/pelemegomonaw.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_off00021cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21CBC 5536 bytes
SHA-256: a0d921138b5fb8785ac48939bb8d5e25c4966e245a58395e1f06eeb96e6840cd
font_01_sfnt_off00022f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22F69 13060 bytes
SHA-256: 4e2df6d25bfe0b84d27655216f9dca11dc5eaebc816c61819afcaea62280a1e5