Malicious PDF — malware analysis report

Static analysis result for SHA-256 418c74c6633c3dff…

MALICIOUS

PDF

160.1 KB Created: 2021-03-25 11:54:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 0b99fc31f7dff65fef34702987fb43a3 SHA-1: b882dc2815f2f499eb203f30e0992155e0a086d7 SHA-256: 418c74c6633c3dff33a74860a0cb17e9b6b5a2cb8c201018c8501a18298e6933
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to known malicious redirectors and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and appears to be a lure, likely intended to trick users into clicking the malicious links for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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
  • 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 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/award?keyword=biography+of+chinua+achebe+pdf In PDF document text
    • http://juzezudusota.mypressonline.com/axis_blue_chip_fund_growth.pdfIn PDF document text
    • http://pawusewi.sportsontheweb.net/gapowitikisadabo.pdfIn PDF document text
    • http://wunuxuvi.sportsontheweb.net/bluetooth_4._0_specification.pdfIn PDF document text
    • http://pobunav.sportsontheweb.net/download_terjemahan_kitab_al_mughni.pdfIn PDF document text
    • http://sevoxotedeki.medianewsonline.com/xewuroj.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/eccab217-aeab-4273-b1fb-d3fac193a45d/new_the_monkey_king_1_full_action_movie_in_hindi_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/budixavapuli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6b3d7ba-b667-4639-8bb6-d468274bb578/14652166221.pdfIn PDF document text
    • https://2e96d104-cacc-4af9-914c-411927af6089.filesusr.com/ugd/0f866b_d73ca6caa9134869a862215224113ead.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/913c4613-6948-4e18-b8e1-f54545d4b13a/42700969000.pdfIn PDF document text
    • https://4541bc1c-e35c-4de3-bb44-1f53c3e1a56d.filesusr.com/ugd/68f66e_67c294cec7e7457fbf67d351a71e452e.pdf?index=trueIn PDF document text
    • https://c31d65df-273c-4bcc-acfb-7b03b0724b99.filesusr.com/ugd/e7e4a0_071b337b5bae47c7a0fc71bef70c5039.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ee67a8b-bb39-4c42-aae5-31459c87cffc/43933441992.pdfIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_b77440f08c734c1ea042566353489063.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/45707e6d-8ffa-4f98-ad86-39f4d2141dd0/95356156015.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/channel_7_tv_guide_sydney.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ade492a9-7b1c-4f07-9985-109a993acce2/realtek_hd_audio_driver_not_working_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ffcae74-e1f8-40d4-b760-c819a471324a/vidotuxisijadubeze.pdfIn PDF document text
    • http://togewogovimome.epizy.com/font_awesome_cheatsheet_old_version.pdfIn PDF document text
    • http://kozusabupo.epizy.com/fractions_to_decimals_worksheet_6th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/jowifon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/294be1d4-ea85-4ed2-b552-b262f9b6a81b/42650488444.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b4872d8-cd8c-4d7c-bc91-a555aec1d9b9/tepogogiki.pdfIn PDF document text
    • https://s3.amazonaws.com/borokegujuzero/sodasisilisitijubewi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00021723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21723 5500 bytes
SHA-256: 2ce28943180c198f8ae28fb786b50c5ed9a464de470955578c615e13cad08a80
font_01_sfnt_off000229df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x229DF 13628 bytes
SHA-256: 79dd75f92dbcb1aff736934acd7114cdd1c7215e040c5d71aa511f77ce865d76
font_02_sfnt_off00025598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25598 18600 bytes
SHA-256: 6fdc74529dc110bc93e23c9186eb71ac9ecb72431172ab21a14eb0d18d28fab3