Malicious PDF — malware analysis report

Static analysis result for SHA-256 77758498f94ae59f…

MALICIOUS

PDF

84.2 KB Created: 2021-06-12 05:32:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8386fdb99bc914f9f7f128f992723325 SHA-1: a7ef29e7d9035f1e11d81a02c138429fb11f534a SHA-256: 77758498f94ae59fb470a2e57b000c724f7820c609114d390c767c1cebcc37c9
194 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful sites. The presence of a 'download' button lure further supports the phishing or malware distribution motive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://huntic.ru/pbw?utm_term=hyper+ball+brick+mod+apk PDF link annotation
    • https://nogapixefakul.weebly.com/uploads/1/3/4/5/134590999/tamulo.pdfIn PDF document text
    • https://zexibimugurarem.weebly.com/uploads/1/3/5/4/135400238/lekez-sotufujibaji-zedapopabi.pdfIn PDF document text
    • https://veraxoli.weebly.com/uploads/1/3/4/0/134040716/vivakefowarib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424331/normal_60303290b30e0.pdfIn PDF document text
    • https://viwejabaru.weebly.com/uploads/1/3/4/7/134749074/5c09633e3c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375541/normal_60093146ea6a8.pdfIn PDF document text
    • https://buwofapakudo.weebly.com/uploads/1/3/5/3/135316190/9801648.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462727/normal_5fec7f892b94f.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/f49125b9-28ca-4bac-8fd3-61fa5f1ec4eb/demonstrative_pronouns_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a54ce26-53cf-4fa0-9d98-58c4913d6b75/how_much_do_you_get_paid_at_chick_fil_a_for_part_time.pdfIn PDF document text
    • http://pebokuvog.pbworks.com/f/new_grammar_with_a_smile_class_7_free_download.pdfIn PDF document text
    • http://siwuromo.pbworks.com/w/file/fetch/144560331/libro_de_probabilidad_y_estadistica_para_ingenieros_montgomery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48966540-b006-422d-b2bf-c15bd83ebc9c/assembly_instructions_for_ikea_malm_bed_frame.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/f/beyblade_burst_turbo_all_episodes_in_english_download.pdfIn PDF document text
    • http://gufabewa.pbworks.com/w/file/fetch/144754296/cuaderno_de_trabajo_de_matematica_para_quinto_grado_de_primaria_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/580c351d-7025-4212-a952-d4e593003d7d/how_to_use_the_swanson_speed_square_video.pdfIn PDF document text
    • http://javefanudosa.pbworks.com/f/solorej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/846788c6-0eb7-48a9-97ba-a8f26ec18eab/80392881274.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77af1494-dcc3-4415-a0a3-4a233af35674/roku_remote_volume_control_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15ecef79-2601-49a8-971c-a3048181ebc9/pokemon_adventures_books_amazon.pdfIn PDF document text
    • http://komogabovuwa.pbworks.com/w/file/fetch/144587868/jack_the_giant_slayer_full_movie_in_hindi_download_480p_mkv.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB47 2996 bytes
SHA-256: 91c65d4daef29bab276e56b606f9c5013e4f13bc29c78e9eee33dd87ab02342c
font_01_sfnt_off0000f60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60B 5308 bytes
SHA-256: 43db076a58a2033e02e5534040037593f6f833be788f023756de2866f052c314
font_02_sfnt_off00010803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10803 10824 bytes
SHA-256: 29b4289bd803e6b409a58ca18b4f130440b8aabfe573f3ac1d188aa82d39640d
font_03_sfnt_off00012d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D39 16164 bytes
SHA-256: e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6