Malicious PDF — malware analysis report

Static analysis result for SHA-256 54e790931cfa8f08…

MALICIOUS

PDF

72.8 KB Created: 2021-02-27 14:10:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 0657e0ad58a1a5c711ceb1d931698381 SHA-1: cb8a73f5c41a4d8d13569e14563568c44889325e SHA-256: 54e790931cfa8f08908c1c37d4f25cbce74e3ea48ee3fad93cb770e81dab6e31
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external PDF files hosted on disposable domains, likely to obscure the true malicious destination. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document's purpose is to trick users into installing malicious browser extensions or plugins, a common method for credential theft or further malware deployment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://nipisod.ru/wix?keyword=this+one+summer+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/pijovowifil/gfjchfL/tefukameniladopag.pdfIn PDF document text
    • https://gekuraneg.weebly.com/uploads/1/3/1/6/131637503/zevedidin.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/99501959393.pdfIn PDF document text
    • http://tomandbxof.site/51324649464ywqgo.pdfIn PDF document text
    • http://worelimupuvefam.mywebcommunity.org/93764809658.pdfIn PDF document text
    • https://wokonupojelofa.weebly.com/uploads/1/3/5/3/135351156/53fb51818fbf6.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/gdgiihd/73077565002.pdfIn PDF document text
    • http://bikejesoxatelo.mygamesonline.org/how_to_do_the_aa_12_steps.pdfIn PDF document text
    • https://cdn.sqhk.co/firokizita/iDxicgd/to_do_list_free_download_word.pdfIn PDF document text
    • http://dorulezebum.sportsontheweb.net/fitbit_flex_2_price_australia.pdfIn PDF document text
    • http://gutagige.sportsontheweb.net/firehouse_subs_calories.pdfIn PDF document text
    • https://cdn.sqhk.co/zopizote/qnGiav1/weezer_say_it_ain_t_so_chords.pdfIn PDF document text
    • http://nesebonuvobeju.getenjoyment.net/excelsior_brewing_patio.pdfIn PDF document text
    • http://gejudoxe.mypressonline.com/luwutowilajefebovase.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xidazeze/guide_invocateur_ff14_5._0.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/what_do_i_need_for_the_10_day_green_smoothie_cleanse.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_off0000e1fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FE 5324 bytes
SHA-256: 7796447f771d1c65ee6839a241868703f8771b5bde14b4243e8503a641d71b86
font_01_sfnt_off0000f3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FD 10112 bytes
SHA-256: 82a22e8aa401029cb98a10e2cdb43118cc4cf968a2410867144fe5345da73cc1

Open this report in the interactive analyzer, or submit your own file for analysis.