Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c92684738b4e1bd…

MALICIOUS

PDF

84.1 KB Created: 2021-03-06 18:41:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6169232f95102fa3fc0a73f68f60fc00 SHA-1: 5c77e5a10af56d83b19aeeeb061cb234e06045ca SHA-256: 7c92684738b4e1bde9f2ea70d144e547330c43ac2a8cb2ca47af9181daec1559
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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=howl%2527s+moving+castle+theme+piano+cover In PDF document text
    • https://puwawegolawibot.weebly.com/uploads/1/3/2/6/132682739/3569061.pdfIn PDF document text
    • http://fejekadiwoxobiz.getenjoyment.net/94360177250.pdfIn PDF document text
    • https://cdn.sqhk.co/gojelonub/fggXgc9/best_pictures_of_the_eagles_band.pdfIn PDF document text
    • https://nizufijaduwetep.weebly.com/uploads/1/3/5/3/135309937/wenulowuxivapir.pdfIn PDF document text
    • http://gekodejevotug.medianewsonline.com/logitech_mk710_review_cnet.pdfIn PDF document text
    • https://cdn.sqhk.co/rujuwawuju/29zlPhd/povojazolonoxo.pdfIn PDF document text
    • http://kujunat.medianewsonline.com/62862213469.pdfIn PDF document text
    • http://xagakojitogiva.getenjoyment.net/how_to_use_photoshop_cs3.pdfIn PDF document text
    • https://bativazuwa.weebly.com/uploads/1/3/0/9/130969541/baxodivudonib.pdfIn PDF document text
    • http://bokaxakoz.sportsontheweb.net/punctuation_comma_rules.pdfIn PDF document text
    • http://mevuvil.iblogger.org/duxolekededajakuzonex.pdfIn PDF document text
    • http://vorakumezaxof.mygamesonline.org/suny_farmingdale_map.pdfIn PDF document text
    • http://bewilotaweje.mywebcommunity.org/is_the_sat_black_book_good.pdfIn PDF document text
    • http://dimozakebaba.scienceontheweb.net/how_much_should_it_cost_to_repair_refrigerator.pdfIn PDF document text
    • http://pinopizo.sportsontheweb.net/a_study_in_scarlet.pdfIn PDF document text
    • https://xurozakewera.weebly.com/uploads/1/3/1/4/131414240/xeguber.pdfIn PDF document text
    • http://votixibutiro.medianewsonline.com/turibizedinijib.pdfIn PDF document text
    • https://cdn.sqhk.co/gukokefa/igeidhi/nujunipulexitagu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xinozotaga.rf.gd/is_the_king_james_bible_the_inspired_word_of_god.pdfIn PDF document text
    • http://rinimodosejowuf.myartsonline.com/53827976554.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC77 9280 bytes
SHA-256: 3671ab58678712123dae7b9a5aa43aeefc0cf5d2958ddae6a61865d68c6085eb
font_01_sfnt_off0000fbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC7 5284 bytes
SHA-256: b02f516d5df2e89a4c83dfc4ff6577b3b85f0817cf9f108ad3c049c0f4a4b5b8
font_02_sfnt_off00010da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA4 11468 bytes
SHA-256: 99fffb2c9e9b73b201c49c474e06e350906320c05e808806afb84cdd2d8f8dfc
font_03_sfnt_off00013494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13494 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2