Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b99b3516fb1c68e…

MALICIOUS

PDF

89.0 KB Created: 2021-04-16 18:37:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: f415cbe34dc6d43ad51c1138f163a91f SHA-1: 5eda59f149c70ee2e76ca498bfb8f41ef98940d0 SHA-256: 0b99b3516fb1c68ebe2211bdec870573cba6f2ef250f2384b052e2550c99cd31
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to suspicious or unknown domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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.
  • 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://dafemum.ru/strik?utm_term=fun+with+a+pencil+review In PDF document text
    • https://selilanabos.weebly.com/uploads/1/3/4/8/134875664/50320.pdfIn PDF document text
    • http://idealica-it.website/how_to_install_gta_vice_city_crackbw0a4.pdfIn PDF document text
    • http://itslm.fun/75097296829y2c5q.pdfIn PDF document text
    • http://raffle.website/blank_baby_shower_bingo_cards75tl4.pdfIn PDF document text
    • https://soliduratop.weebly.com/uploads/1/3/2/3/132303261/pefuwibutagino_lewufu_butoxu.pdfIn PDF document text
    • http://zavodtriumf.com/cat_haven_adoption_pricesxl872.pdfIn PDF document text
    • https://serudifatu.weebly.com/uploads/1/3/5/3/135324897/kidadisewamavus_rogorebu_sisixi_dugunor.pdfIn PDF document text
    • https://xaxibilezulaf.weebly.com/uploads/1/3/4/0/134096047/90f4a52165.pdfIn PDF document text
    • https://lefagetali.weebly.com/uploads/1/3/2/3/132302894/zenikedugid.pdfIn PDF document text
    • http://idealica-official-it.website/falling_into_christmas_castkth4f.pdfIn PDF document text
    • http://rezanufeku.mygamesonline.org/bridge_to_ielts_vk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://75ca6b5e-a470-4e0e-8004-b00a9f1721b4.filesusr.com/ugd/1e4819_0e57e76abf5a49eeb5762c97339cb194.pdf?index=trueIn PDF document text
    • https://9e084d23-5bbf-42ad-98e9-fa9200f8584e.filesusr.com/ugd/4f663b_119aee5e602c4a9c85c35275a12a5768.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/50661597280.pdfIn PDF document text
    • http://xolavozezimodan.onlinewebshop.net/common_american_english_words_used_in_daily_life.pdfIn PDF document text
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_5b2112a5fc754945bd4f01e3c9752fa6.pdf?index=trueIn PDF document text
    • https://c6f55193-7475-4343-97dd-33cb3b141b6a.filesusr.com/ugd/808d8c_78e693daad144ebdb0ac4d80c65fe3df.pdf?index=trueIn PDF document text
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_0d6a6a498154427b8265ba2588f077f6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/12086731289.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/throne_of_glass_series_parent_review.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/agatha_christies_poirot_season_13_episode_3_cast.pdfIn PDF document text
    • https://070488ba-e3d9-4c74-834b-445551f5513c.filesusr.com/ugd/fb83f1_95a3fbec4cab424a943001ba320b1bed.pdf?index=trueIn PDF document text
    • https://80c8fd16-4cf8-4f9f-b52b-d6c956df8f3b.filesusr.com/ugd/1a94e8_cc4589c3c41a412195fa90f8ddb72f1a.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_off00011e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6E 4952 bytes
SHA-256: ec83c0c293acf5ba831e3b4ad9f929ff6d1c547469b27dfa43e5cbccf462c265
font_01_sfnt_off00012f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5A 11656 bytes
SHA-256: 8982bc56cc411e3090eb84303297dbfef98f194e6dd67cfe76abd2e55123017b