Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9368e198bc9bb44…

MALICIOUS

PDF

77.6 KB Created: 2021-05-17 17:32:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c85bf23bb0015f83263808f227edf0f SHA-1: 1a2d900bd2ad70224214fe29c120f37a031093c4 SHA-256: d9368e198bc9bb448efc48cd5f97dea27ea6eb2045749620cd77cec4bd284ff6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated and point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URLs and the document body's deceptive content support the conclusion that this PDF is designed to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/strik?utm_term=why+is+my+lg+smart+tv+remote+not+working
    • http://khareedforosh.com/toxusojoxajokusilixejkiisn.pdf
    • https://suterigegopos.weebly.com/uploads/1/3/2/6/132695321/506276.pdf
    • http://testrun.ru/tolawagoxnvxm6.pdf
    • http://shoop-fk.ru/lepegukorakemimipefb7pv4.pdf
    • http://boldly-grow.com/14688162978xv2i2.pdf
    • https://pijewiki.weebly.com/uploads/1/3/5/9/135966210/4727539.pdf
    • http://vamoktin.ru/best_to_word_converter_online_nitro6woy9.pdf
    • http://makedctl.site/how_to_repair_a_culligan_water_softenerjqdng.pdf
    • https://fosubenasodu.weebly.com/uploads/1/3/4/0/134097760/jorixozaboga.pdf
    • http://madamzero.com/what_is_hearts_of_iron_42a0es.pdf
    • http://questotzvezd.space/adobe_indesign_newspaper_templates0o4z6.pdf
    • http://thelandofbadideas.com/how_to_use_the_harbor_breeze_remotem5q0y.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/jinotugiwomo/virginia_boating_safety_course_study_guide.pdf
    • https://s3.amazonaws.com/mipizaju/wezopilo.pdf
    • https://s3.amazonaws.com/fuzafuzeruwit/bang_bang_full_song_320kbps.pdf
    • https://s3.amazonaws.com/fogibi/waec_chief_examiners_report_2016.pdf
    • https://s3.amazonaws.com/kokesatodixon/sony_bravia_screen_format_full.pdf
    • http://jesasudazewur.epizy.com/74198017241.pdf
    • https://s3.amazonaws.com/dukavunivifa/37241656759.pdf
    • https://s3.amazonaws.com/gagagakigibapo/79695747327.pdf
    • http://xitunixanamo.epizy.com/broadcasting_script_tagalog.pdf
    • https://s3.amazonaws.com/metubevozisul/how_to_connect_roomba_to_wifi_5ghz.pdf
    • https://s3.amazonaws.com/zizene/69062920198.pdf
    • http://mabezaze.epizy.com/edexcel_igcse_biology_revision_guide_download.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e483.bin
86ed8164cc6fa1d7224b07a91ede053bc613e5ced790d1b53bb3542ac12673e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE483 5216 bytes
font_01_sfnt_off0000f632.bin
02fa0945333c99dfc53d32b2e68467a2a735af067110b586fba7143bfd872d33		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF632 10620 bytes
font_02_sfnt_off00011a98.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A98 4324 bytes

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