Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aa8537d00094dd1…

MALICIOUS

PDF

75.2 KB Created: 2021-02-26 07:52:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b6873282962ffed17d7d589b38cb10cd SHA-1: c7403fa1de63593a4be83c825375af34d3b5e4b9 SHA-256: 6aa8537d00094dd1fdcf9f79b43e2ee319edbac885ff426b111dc7fc2ad6650b
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to known malicious redirectors and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=pioneer+elite+television In PDF document text
    • http://taxokisekajetek.22web.org/gutabowitizux.pdfIn PDF document text
    • http://interbankdigital.com/microsoft_office_online_templates_for_access_2007n3ik0.pdfIn PDF document text
    • https://cdn.sqhk.co/mitugejaxel/ijygehd/basic_woodworking_tools_for_the_unplugged_workshop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459774/normal_5fcc35a718c81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387938/normal_601ee252c99c0.pdfIn PDF document text
    • http://muwilagugo.iblogger.org/viper_5701_replacement_remote.pdfIn PDF document text
    • https://cdn.sqhk.co/penazavoxu/Vgjhdjj/78790995768.pdfIn PDF document text
    • http://ita-fitness.fun/78778579471z5sqy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417659/normal_6010b27bb6728.pdfIn PDF document text
    • http://yatvoyya.fun/adding_fractions_word_problems_with_answerson1y6.pdfIn PDF document text
    • https://cdn.sqhk.co/zezovajav/R23Ejhw/xirezumeze.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwonesi/Fijib2T/84031153774.pdfIn PDF document text
    • https://cdn.sqhk.co/surikuzezun/iihhzig/line_colour_3d_game_apk_download.pdfIn PDF document text
    • http://it50disconto.pro/maroon_5_animals_lyrics_video9crxx.pdfIn PDF document text
    • https://cdn.sqhk.co/tegatiwuwax/chdjihg/vasefobajodakekap.pdfIn PDF document text
    • https://cdn.sqhk.co/senuziker/2iiijwT/funny_video_clips_youtubers_use_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wusakituzu/LSje9hc/voxunogezitebamopaxobami.pdfIn PDF document text
    • http://vibubag.22web.org/zoxikuxo.pdfIn PDF document text
    • http://shoop-fm.ru/71031478038y67ty.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://tewederukafolez.rf.gd/alfresco_document_management.pdfIn PDF document text
    • http://nunusama.rf.gd/19427397267.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_off0000c579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC579 8108 bytes
SHA-256: 545d5fa7c0981fd998e2686de9842e03a2b6603874846b48dd3ea0b29094a1d0
font_01_sfnt_off0000e087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE087 4320 bytes
SHA-256: d30a5c3c2a06da3d4cdb7a27fb8f72278a92efe09389f5401baebcf666f09a55
font_02_sfnt_off0000ef30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF30 9880 bytes
SHA-256: b80a2e2180ea0a494c7e7d850c542b0f46f1ced97c128333926acef11e71a850
font_03_sfnt_off00011108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11108 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378