Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f5a52f85b3f4340…

MALICIOUS

PDF

80.1 KB Created: 2021-06-06 22:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 65ba10d54f66f2d0973e8787d344d816 SHA-1: 923c7ea900fd129c7d94e1076da04416dddc1e93 SHA-256: 4f5a52f85b3f43403fad908a4bd4be9f87d46d5c2e0dbb0356416e5755237f4d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of a URL with 'utm_term=need+for+speed+no+limits+mod+apk+free+download' strongly suggest a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely to trick users into downloading unwanted software.

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
  • 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://cructi.ru/pbw?utm_term=need+for+speed+no+limits+mod+apk+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4490725/normal_5fc5ad11f1309.pdfIn PDF document text
    • https://bavifogo.weebly.com/uploads/1/3/4/5/134524367/2426bf9c3f5.pdfIn PDF document text
    • https://pojebozotez.weebly.com/uploads/1/3/2/6/132695867/5617565.pdfIn PDF document text
    • https://bepupoxusiboma.weebly.com/uploads/1/3/4/8/134847186/3934650.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448538/normal_5fe26abfe404b.pdfIn PDF document text
    • https://dolilufaxeni.weebly.com/uploads/1/3/2/6/132683246/foloxalej-lorazodepu.pdfIn PDF document text
    • https://lobusejorul.weebly.com/uploads/1/3/5/3/135338183/2145365.pdfIn PDF document text
    • https://jopizogado.weebly.com/uploads/1/3/4/3/134317888/ladupemojovidom-filijurevuji.pdfIn PDF document text
    • https://bomexufimewaw.weebly.com/uploads/1/3/4/5/134517434/acfc79b6b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452161/normal_5fc937d955672.pdfIn PDF document text
    • https://bogigevaruzo.weebly.com/uploads/1/3/4/4/134435623/1927850.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391921/normal_5fd8dc2c274ef.pdfIn PDF document text
    • https://mutomutozuso.weebly.com/uploads/1/3/0/8/130814133/8257885.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gonumutat.pbworks.com/f/kuta_software_infinite_geometry_rotations_answers.pdfIn PDF document text
    • http://mamejoniza.pbworks.com/f/sikavawiniwejukigema.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/f/nuwexiwamudukisafelux.pdfIn PDF document text
    • http://wufamazajo.pbworks.com/w/file/fetch/144595299/siyavula_physical_science_grade_11_caps_download.pdfIn PDF document text
    • http://namebitepu.pbworks.com/f/xosevokexenogunawafawip.pdfIn PDF document text
    • http://rugewenuzed.pbworks.com/f/how_do_u_play_10000_dice_game.pdfIn PDF document text
    • http://wijozuzapusa.pbworks.com/w/file/fetch/144475224/69272363423.pdfIn PDF document text
    • http://jobagej.pbworks.com/f/9.snf_kimya_bileik_formllerinin_yazlmas_ve_okunmas.pdfIn PDF document text
    • http://kuzimotum.pbworks.com/w/file/fetch/144667482/gezozisovegoko.pdfIn PDF document text
    • http://damopijos.pbworks.com/w/file/fetch/144612354/forumizijafoxa.pdfIn PDF document text
    • http://midevodimu.pbworks.com/f/96618316258.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_off0000ee16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE16 5312 bytes
SHA-256: c00d47bf105c63836aea9a808ce59b780e56687448bb8ba0aab35723f1222792
font_01_sfnt_off00010026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10026 20656 bytes
SHA-256: 8a737f9d58a942e1839f232d9a386810957ece954643c1c2d08e0ad7f753603c