Malicious PDF — malware analysis report

Static analysis result for SHA-256 a024700751a9c222…

MALICIOUS

PDF

73.7 KB Created: 2021-06-13 01:17:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 558cff6f4f89234ab15cb0e8c3d0d1c0 SHA-1: e19e6060b3b2c6bf8b5e81eae4a949ca256696fc SHA-256: a024700751a9c22271049be59921bead9035b301bbf5774d820f220c82bbc12e
206 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The document's content, though heavily obfuscated, appears to be a lure for a 'Chrome browser app free' download, which is a common pretext for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://leonvi.ru/123?utm_term=chrome+browser+app+free PDF link annotation
    • https://muxolebutelun.weebly.com/uploads/1/3/2/7/132741382/solobefukofoni.pdfIn PDF document text
    • https://paxuxavige.weebly.com/uploads/1/3/4/3/134373921/zamudopu.pdfIn PDF document text
    • https://safuziketuxoxu.weebly.com/uploads/1/3/0/8/130814855/mukonumakonomev_nosunodirizatod_rakad_relunodawetedi.pdfIn PDF document text
    • https://vuvowopivuvi.weebly.com/uploads/1/3/1/4/131410126/dunemosawalaju.pdfIn PDF document text
    • https://javogukurajukip.weebly.com/uploads/1/3/4/2/134235542/bewijapezupede.pdfIn PDF document text
    • https://bewosugug.weebly.com/uploads/1/3/0/8/130814774/fuvabotep.pdfIn PDF document text
    • https://nuruvubapifak.weebly.com/uploads/1/3/1/4/131452890/fidov.pdfIn PDF document text
    • https://takesefitetipal.weebly.com/uploads/1/3/2/6/132682925/2aff4115313e.pdfIn PDF document text
    • https://soguleta.weebly.com/uploads/1/3/4/3/134305846/xopekezo.pdfIn PDF document text
    • https://moliveje.weebly.com/uploads/1/3/5/3/135323163/5101188.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kigemulu.pbworks.com/f/tefelavitasikureredo.pdfIn PDF document text
    • http://bugedavamib.pbworks.com/w/file/fetch/145214373/microbial_genetics_mcq.pdfIn PDF document text
    • http://zexowisam.pbworks.com/f/1768877244.pdfIn PDF document text
    • http://gogoporiwo.pbworks.com/f/87229593092.pdfIn PDF document text
    • http://nuxawakaxaz.pbworks.com/w/file/fetch/144497355/hack_de_monedas_infinitas_para_dream_league_soccer_2019_en_iphone.pdfIn PDF document text
    • http://mumasenekera.pbworks.com/w/file/fetch/144416988/festival_internacional_de_musica_y_danza_de_granada_2019.pdfIn PDF document text
    • http://bawamotijeku.pbworks.com/f/how_to_install_mods_on_minecraft_1.16.pdfIn PDF document text
    • http://jizakatum.pbworks.com/w/file/fetch/144650610/15623499114.pdfIn PDF document text
    • http://fagimox.pbworks.com/f/68535917546.pdfIn PDF document text
    • http://tuvovazuvezo.pbworks.com/w/file/fetch/144652854/mobile_odin_pro_apk_free_download.pdfIn PDF document text
    • http://mijatonevu.pbworks.com/f/main_hoon_na_full_movie_download_free.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE170 5248 bytes
SHA-256: dc533c52d67b1397c301d6cf9a836583ef8f82bd858380ae45d1d2fbd9dd4420
font_01_sfnt_off0000f323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF323 11320 bytes
SHA-256: ebfc1c4b908e97fa6064c8a059fe98f0690dee5b0f4ba9325ec736f6fccf6390