Malicious PDF — malware analysis report

Static analysis result for SHA-256 50c93301700232c9…

MALICIOUS

PDF

76.6 KB Created: 2021-04-25 23:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 84f8f0b00b61eb2b0897b89b301c32c7 SHA-1: 77ee8550543067481a9600137cad05e2f7ab8a86 SHA-256: 50c93301700232c9c8831b709e05e70487a1660e6ffc7bb2642187662a094926
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of external URLs, many hosted on disposable domains, indicating a phishing or link-farming campaign. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement with potentially malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://baarspo.ru/strik?utm_term=how+to+train+your+dragon+toys+walmart PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467004/normal_606a7949af45c.pdfIn PDF document text
    • http://hookup756.fun/27265735859gydc8.pdfIn PDF document text
    • https://cdn.sqhk.co/gozolijitow/jLogcgh/92491127554.pdfIn PDF document text
    • https://lewagezu.weebly.com/uploads/1/3/4/3/134369469/dimeve.pdfIn PDF document text
    • https://luwegojozokozop.weebly.com/uploads/1/3/0/9/130969796/8abb147f0024.pdfIn PDF document text
    • https://tenasedoba.weebly.com/uploads/1/3/4/3/134333827/9914922.pdfIn PDF document text
    • https://cdn.sqhk.co/mivesavif/LihjcDK/ordinal_numbers_1-_20_free_worksheets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420476/normal_60377833d288e.pdfIn PDF document text
    • https://cdn.sqhk.co/wezopexa/gijviaK/dukejilatijirom.pdfIn PDF document text
    • http://andyhong.blog/hp_simple_save_drivers5a06s.pdfIn PDF document text
    • http://rineset.xyz/fix_auto_rotate_on_androidho4b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381340/normal_602cdfa186b74.pdfIn PDF document text
    • https://toxupenowa.weebly.com/uploads/1/3/4/0/134042648/tuxugoviluridiw-bepivugiraz.pdfIn PDF document text
    • https://cdn.sqhk.co/pumibavi/ePjhs6Q/multiple_accounts_on_ipad.pdfIn PDF document text
    • https://cdn.sqhk.co/nimabugokofa/HiY4Nii/summer_vivaldi_sheet_music.pdfIn PDF document text
    • http://ideaita.fun/90689757162esiox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371498/normal_5fdc1162d9564.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/ceefad45-a371-407a-b629-dc567e1dad50/hoover_windtunnel_max_capacity_pet_upright_vacuum_review.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/60642090964.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/tujajomimewik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31add21c-224b-4ad6-bc7e-6d5947f54608/how_do_you_clean_a_keurig_mini_with_white_vinegar.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/how_to_apply_decals_on_car_windows.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/feragomoragizipawibuton.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2ae61e3-65ef-4707-aad2-bd67f9b248d7/what_is_a_good_example_of_personification.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_off0000ead9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD9 5300 bytes
SHA-256: e966344de0e8c05a8c73878d30a3f723a515d1fa246780dc5bde0478eebe1bdf
font_01_sfnt_off0000fcdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDF 11176 bytes
SHA-256: 09fb779ea8f1b470b170d972518ca7015180d4245f621e63e0e6611e105a84d1