Malicious PDF — malware analysis report

Static analysis result for SHA-256 833caec860f531fc…

MALICIOUS

PDF

75.6 KB Created: 2021-03-28 00:00:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 460c13d22dbc1366f7cf8b423988ce8b SHA-1: f56c712153e17ccf08540abfe796cb2d64aa38ea SHA-256: 833caec860f531fc80d72aca1886a148d930e0a3aaba6c7b4564de7ec5e73d39
186 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 functions as a link farm, containing numerous external URLs that point to other PDF documents hosted on various platforms. The primary purpose appears to be directing users to potentially malicious content, such as phishing pages or malware downloads, under the guise of search engine optimization content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://soxebez.ru/123?utm_term=trastorno+de+ansiedad+y+depresion+tratamiento+pdf PDF link annotation
    • http://govnosiakxws.online/fedubemesuwunijimaviw4ztl.pdfIn PDF document text
    • http://nijepatexosanus.medianewsonline.com/caramelization_process.pdfIn PDF document text
    • http://datiwufirul.medianewsonline.com/nezodaragog.pdfIn PDF document text
    • http://bella24.xyz/maritibukovufujxnh.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/how_to_get_starbucks_schedule_online.pdfIn PDF document text
    • http://vashe-zdorovie.xyz/sq11_mini_dv_camera_manual_cz6btq1.pdfIn PDF document text
    • http://rosativiwam.mypressonline.com/after_we_fell_book.pdfIn PDF document text
    • http://niburufajanuto.sportsontheweb.net/2735000707.pdfIn PDF document text
    • http://riniwodifole.medianewsonline.com/duruse.pdfIn PDF document text
    • http://dujojiwasemob.mywebcommunity.org/lord_of_the_rings_all_parts_in_hindi_free_download_filmywap.pdfIn PDF document text
    • http://perevod24-card2card.site/gcse_english_language_question_2_model_answer3zsux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7c9e9c40-2b96-4f88-8065-b5ff5e495659.filesusr.com/ugd/3bfcae_82486aed0ce54d20a706fcf1b6975243.pdf?index=trueIn PDF document text
    • https://4b3b4da4-1145-40fd-8a04-0ac29766dab0.filesusr.com/ugd/6c6203_b5547e8df3c64d19a72c9f1dcf27e997.pdf?index=trueIn PDF document text
    • http://vipuzala.myartsonline.com/52676237295.pdfIn PDF document text
    • https://3ea853e4-7f2b-4fb0-9229-b04907a1e321.filesusr.com/ugd/d94095_fa3925d2a59747fead59c937807b0ad5.pdf?index=trueIn PDF document text
    • https://9c12218e-e157-4070-b33f-4467b3cb42bb.filesusr.com/ugd/0c60a0_0776e633b0b24cff84995775e6b4b141.pdf?index=trueIn PDF document text
    • http://pulutugorivexek.atwebpages.com/siruvopakupevogofifitopi.pdfIn PDF document text
    • http://bofogaf.rf.gd/dapifawuzixavifexepemiw.pdfIn PDF document text
    • https://83372c7a-1065-4b07-8284-b64562b46e84.filesusr.com/ugd/035489_13a2653e5cb746f5a951be3c07496e3b.pdf?index=trueIn PDF document text
    • https://95049c82-e412-4913-a0b0-e03e83d5170a.filesusr.com/ugd/127d6e_82f92b63af684838b896864c362bab35.pdf?index=trueIn PDF document text
    • http://wesatume.atwebpages.com/engineering_drawing_handbook_free_download.pdfIn PDF document text
    • http://tosopipates.epizy.com/landslide_in_kerala.pdfIn PDF document text
    • https://56c41596-c8b3-4aa7-a075-23c9724d7f97.filesusr.com/ugd/ed77b2_a7c5b1a8fa6446e69ce6fa6e5e89cbd0.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE976 5208 bytes
SHA-256: 7114cf45d27e20b875e4a936eac3db7e108f689b608ace0d77cbb0591defcde0
font_01_sfnt_off0000fb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB20 10968 bytes
SHA-256: 21b74b710105b02890498a4b0a79a87353d7529f1e26fcdce491b33f015fe32b