Malicious PDF — malware analysis report

Static analysis result for SHA-256 27af185e916fc94a…

MALICIOUS

PDF

87.5 KB Created: 2021-05-06 04:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: bca977fceb4f5eb5bfa83756c7688218 SHA-1: 04001ed13f32e533ff4343957d608a0d980bc73d SHA-256: 27af185e916fc94aed7448139a8ce7351ddd0ac9ded5bdf12f17ad29e71ec99a
184 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure and a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves luring users to malicious sites via embedded links, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=therapeutic+foster+home In PDF document text
    • https://cdn.sqhk.co/malevevipali/8gczjgi/forza_horizon_4_best_s1_900_rally_car.pdfIn PDF document text
    • http://ketupepid.22web.org/vanuzafomebizulugamolub.pdfIn PDF document text
    • http://potoborotagivud.22web.org/mekujonupugurumizojexeno.pdfIn PDF document text
    • http://tokudujadi.medianewsonline.com/tennis_elbow_exercises_arthritis_uk.pdfIn PDF document text
    • http://jipetabonitu.mywebcommunity.org/american_red_cross_lifeguard_test_answers_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/lajagika/rNigHVs/60025086997.pdfIn PDF document text
    • http://xazowagef.mypressonline.com/56618943392.pdfIn PDF document text
    • https://cdn.sqhk.co/fakineduxafe/cgjxdij/machine_robo_rescue_episode_list.pdfIn PDF document text
    • http://movilatur.iblogger.org/paper_butterfly_cutting.pdfIn PDF document text
    • http://pidagenavuziw.mywebcommunity.org/capacity_management_in_operations_management.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5f384421-c3d0-4b4c-85a6-d3745974446f.filesusr.com/ugd/40006b_c4a18d8b542841a3ba0d109948fcb1ff.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c26c1793-0003-44a8-9ea1-1ddb0760ec90/libros_de_fisica_segundo_de_secundaria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8785e76c-7483-44aa-80cf-398a01b8f905/94062917309.pdfIn PDF document text
    • https://994180ce-385f-4272-9833-4a204a825e0f.filesusr.com/ugd/ec0c41_d46451ce44cc411994f1253377c507fd.pdf?index=trueIn PDF document text
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_e7fc8b5525fb4823ac6924a26c32d475.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/62e1bb3a-2c56-43bf-ad45-5babc978f2a9/boss_gt_1000_price_philippines.pdfIn PDF document text
    • http://sibugisijan.epizy.com/deforestation_essay_download.pdfIn PDF document text
    • https://40ba1f7a-6e91-49bb-bbb8-dfbb40a2bc60.filesusr.com/ugd/22bf55_62aa9775123c4a199e4fc5df0b1bffd3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7e5f116-7865-493e-9559-44cf44fc042f/54204061291.pdfIn PDF document text
    • http://xaligapuk.epizy.com/breath_of_the_wild_cemu_rom.pdfIn PDF document text
    • https://21d44941-995c-48b9-956b-8145330e20d5.filesusr.com/ugd/577b75_c83e4f65e19b418896af3be4d6e22ace.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EB 5172 bytes
SHA-256: 9c82f7a59a87531106c1beaedc6e1eaf141ab87cc14c8c0e13d3ffe8a3fae099
font_01_sfnt_off0001155c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155C 10824 bytes
SHA-256: 3cc75c849e625232a8bc99d32a6f5ba4bb825f04c79f4fb72f1029cab6de6de8
font_02_sfnt_off00013a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A9A 16060 bytes
SHA-256: 4ef9506ee11a349461550e6b437e3786686b598308a87786035880d16624999d