Malicious PDF — malware analysis report

Static analysis result for SHA-256 f41ab070cd0b538f…

MALICIOUS

PDF

89.6 KB Created: 2021-03-29 21:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: bbbec755af347a0ff831083d7ee3c829 SHA-1: 1cc0cf918195d134594cd29a72a1baaedff009d5 SHA-256: f41ab070cd0b538f11b337922b250956e6953680c90207701657694d135a990b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm or SEO spam. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point to the use of embedded JavaScript for redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://botokaw.ru/award?keyword=can+t+help+falling+in+love+violin+and+piano+pdf PDF link annotation
    • http://zovolexune.sportsontheweb.net/how_to_count_numbers_in_a_list_python.pdfIn PDF document text
    • https://cdn.sqhk.co/zisujidixa/fhi9cuW/jiohealthhub_your_health_companion_app.pdfIn PDF document text
    • https://cdn.sqhk.co/gizulakofo/idgfYHi/gba_emulator_for_pc_free_download_full_version.pdfIn PDF document text
    • http://saporik.scienceontheweb.net/dnd_dice_roller_app.pdfIn PDF document text
    • https://cdn.sqhk.co/zidexamuwela/Tnhhidt/video_downloader_instagram_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/nodewanase/Cic3qEi/summoner_heroes_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/terupilenu/fCl8sii/12378353485.pdfIn PDF document text
    • https://cdn.sqhk.co/xetajikok/szwMkjb/ouroboros_ring_gold.pdfIn PDF document text
    • http://rakadan.sportsontheweb.net/amino_acids_and_proteins.pdfIn PDF document text
    • https://cdn.sqhk.co/movumatoz/qojbFYy/clear_virus_on_iphone_8.pdfIn PDF document text
    • https://cdn.sqhk.co/dutaxato/SbRifO9/real_racing_3_pc_size.pdfIn PDF document text
    • http://retapadu.medianewsonline.com/91062904037.pdfIn PDF document text
    • https://cdn.sqhk.co/nodewanase/jaAibL9/wexopitofo.pdfIn PDF document text
    • https://cdn.sqhk.co/jujifefa/RxchaZE/janta_ki_adalat_video_songs.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
    • https://968bac2e-1409-45a7-bd11-2c37eba47390.filesusr.com/ugd/c81504_09ee8860e46e4b55bb5bc83006dd5bef.pdf?index=trueIn PDF document text
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_31f1b39def504f3fbcebbee4e6986ff3.pdf?index=trueIn PDF document text
    • http://matewedidoxeber.onlinewebshop.net/a_level_physics_cambridge_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83284459-7c63-4b57-8f2f-56bb2d1ca566/festival_of_2021_year.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c869d311-fcad-43f8-a411-60822ee0b6e5/what_qualifications_do_you_need_to_be_a_cashier.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5d9e55f-f6cf-42f2-883d-0727bf14750b/xikixanadin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/deba4f64-1eaa-4b51-892b-a1ba689f13da/a-level_biology_question_paper_paper_3_june_2018.pdfIn PDF document text
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_9a0083bdac4e42baa832eaf253d80f73.pdf?index=trueIn PDF document text
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_5a6ab1ebb0844058a3d038823d16c7b3.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1D 4900 bytes
SHA-256: 2c9b0b0d81571503f26ea91e29bacad8fb98cff4b963fc0a4b5191435ae9bfe5
font_01_sfnt_off00010dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD4 11584 bytes
SHA-256: dcb615a6630f9d0efd028b4ae581065becc0dca5c5c32bd5bdabf2f8816e051f
font_02_sfnt_off00013594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13594 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7
font_03_sfnt_off00014a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A2C 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e