Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ab34c58c2bc0f8c…

MALICIOUS

PDF

71.3 KB Created: 2021-04-22 03:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9b332561210f2a09941c00ceb1eab9c6 SHA-1: 2c2e9ecb7e78dff3889ffc76582aadb06530249c SHA-256: 9ab34c58c2bc0f8c5e2d0019169185417c71a773ba6212651212c0b9ad892ec5
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in link farms to artificially boost search engine rankings or to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The embedded URLs and the PDF's structure suggest it's part of a larger campaign to drive traffic to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/strik?utm_term=how+to+replace+a+rain+bird+sprinkler+valve+solenoid PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366348/normal_6036396232194.pdfIn PDF document text
    • http://mylic.ru/criminology_books_in_tamil_free_download0x7cx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370092/normal_601b76519fd2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385434/normal_6025602d66c27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411001/normal_605ad1522eb13.pdfIn PDF document text
    • https://cdn.sqhk.co/poxirowo/igOrgf6/netivuribafefilugise.pdfIn PDF document text
    • https://cdn.sqhk.co/sanojuxako/gUKRsPD/answer_back_to_me.pdfIn PDF document text
    • https://cdn.sqhk.co/suwefememe/jbidahb/lopuduvulotixip.pdfIn PDF document text
    • http://invitesistem.ru/bose_wave_radio_cd_player_bluetootht5hfj.pdfIn PDF document text
    • https://cdn.sqhk.co/nusatabi/flifibh/tulutidujadipululigelilo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427529/normal_6032e150a7c59.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/d348c8da-4de5-42b6-908a-b25a71b70f77/86619074304.pdfIn PDF document text
    • https://d38713d8-f9e0-49bf-8e72-3f46774ce551.filesusr.com/ugd/b3faf5_236bfe620acc45cc9c1665d6771ac7b5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f3fdcc3-5d93-4030-a823-9d23efd5b6d2/gesawafoxe.pdfIn PDF document text
    • https://e29a9437-b0a5-48a6-9afa-908397ce514a.filesusr.com/ugd/16a9c1_bafe0f6bbc0f4e249f28dfe9c2e41fd7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/be2d6c02-a4b0-4e2b-a00a-7b75a1b1881c/setineruz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc525e41-0da8-4a12-aa6f-bab2daac5f70/how_to_finish_a_roast_in_the_oven.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3b12c29-7944-4808-bc40-680dea106ade/which_book_is_best_for_financial_management.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2040efd2-0120-41d4-99a7-2e30dc29d6a2/how_to_get_rid_of_directions_hair_dye.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d256ffa-1c89-45e4-93ae-5cb22e43aa17/hp_1320_printer_driver_windows_10.pdfIn PDF document text
    • https://30fe55a9-f0c7-4aec-9bf5-b9d2225d99a8.filesusr.com/ugd/c4a51e_08eaa341f7fd4074a572a2ed37cd26d5.pdf?index=trueIn 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_off0000d9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FD 5384 bytes
SHA-256: 17f96d5a118d1c33284e2e0471bf19d2ee6cf11fddb3c134c34732001637a0af
font_01_sfnt_off0000ec63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC63 10328 bytes
SHA-256: f8935e97e2a11cdc983094b937465d184a3914782e2101cf3c42e957deb69831