Malicious PDF — malware analysis report

Static analysis result for SHA-256 5430253d8871ea67…

MALICIOUS

PDF

73.4 KB Created: 2021-03-08 22:37:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3f637ef91947be96b456a8f282595e6f SHA-1: 841eb3cd1751cf02949acd540d69d35a02e12955 SHA-256: 5430253d8871ea67042a58a4f362047112b8dc2eb1ddfa5086b98d1bdb3aa2b6
166 Risk Score

Malware Insights

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

The PDF contains multiple heuristic firings indicating malicious intent, including random and disposable URLs, and is flagged by ML classifiers and ClamAV as phishing/malware. The embedded URLs, such as http://nubolutlion.xyz/pinunepuvexetamozutebipoyevep.pdf, are likely used to redirect users to malicious sites for further exploitation or credential harvesting. The document body, though heavily obfuscated, contains references to wkhtmltopdf and Qt, suggesting it was generated programmatically to appear as a document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not 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.
  • 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://mezovuduw.ru/wix?keyword=snow+border+games PDF link annotation
    • http://texno3ua.com/5186493581807zsb.pdfIn PDF document text
    • https://cdn.sqhk.co/pelopuxi/jijbQfa/getexawusifokojalebeb.pdfIn PDF document text
    • https://cdn.sqhk.co/zejizoguzut/jwijiaR/may_2020_top_rap_songs.pdfIn PDF document text
    • http://lelonul.iblogger.org/75438534194.pdfIn PDF document text
    • https://cdn.sqhk.co/sozodumupof/jbicSPU/war_of_worlds_full_movie_online_free.pdfIn PDF document text
    • https://cdn.sqhk.co/zunezafi/jjgKIjc/android_barcode_scanner_example_github.pdfIn PDF document text
    • https://cdn.sqhk.co/vujenibolo/agdidge/bewapareb.pdfIn PDF document text
    • https://cdn.sqhk.co/keliziniw/W6osaUo/anime_lock_screen_wallpapers.pdfIn PDF document text
    • https://cdn.sqhk.co/wujakegu/4gijd7C/gujakax.pdfIn PDF document text
    • http://trening-ekaterinodar.ru/65223055232dac50.pdfIn PDF document text
    • https://cdn.sqhk.co/givifevulo/irQfig8/free_racing_games_download_for_ipad.pdfIn PDF document text
    • http://nubolutlion.xyz/pinunepuvexetamozutebiporpzfuf.pdfIn PDF document text
    • https://cdn.sqhk.co/xulawajikigi/jbhbtjc/18034923731.pdfIn PDF document text
    • http://ctyr.ru/42220076576y6s9r.pdfIn PDF document text
    • https://cdn.sqhk.co/vumivatuvi/ieicC4K/39622444485.pdfIn PDF document text
    • http://powerpoint4you.ru/69715831257y064w.pdfIn PDF document text
    • https://cdn.sqhk.co/tivanosox/g9Czjkd/cadeira_gamer_mad_racer_v8_turbo_preto.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lofupiwosilabo.epizy.com/final_fantasy_xv_royal_edition_ps4_review.pdfIn PDF document text
    • http://ruzuvune.epizy.com/gekavolodevawezikoxisufid.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/nokia_android_phone_amazon_india.pdfIn PDF document text
    • http://xezipunefosipu.epizy.com/wukadorotuxetoxasekipu.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/28085474335.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/what_is_hybrid_computer_very_short_answer.pdfIn PDF document text
    • http://vunolipatebaw.rf.gd/informal_vs_formal_reports.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_off0000e18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18E 5448 bytes
SHA-256: 2839f90f7f0601b587e6287cc1e0d3521b1b4b5e2e28608d26bd32834d1de842
font_01_sfnt_off0000f40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40E 10624 bytes
SHA-256: f2d608164ddc71abcc20d16449a9c411ed72a6fb8981c2159b1228d2f8498558