Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c259ff31439080a…

MALICIOUS

PDF

75.1 KB Created: 2021-03-06 04:26:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: bf1e66ee2400f39ca0d3e52eb9bae065 SHA-1: d096d30ae32ec177f6902574e1e33a338bed7ba9 SHA-256: 5c259ff31439080abde7deeae5e278f5bab9b3249bad53325e13f41962e8d8c0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, contains keywords related to 'Semana santa honduras 2018' and the authoring application 'wkhtmltopdf', suggesting a lure to redirect users to malicious sites. The presence of external URIs and the link farm heuristic indicate a strong intent to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://jacksth.ru/wix?keyword=semana+santa+honduras+2018 PDF link annotation
    • http://nigavereke.mygamesonline.org/zuparidosoxi.pdfIn PDF document text
    • http://guzexesuge.mypressonline.com/vfr_sectional_map_legend.pdfIn PDF document text
    • http://idealslim-ordina.site/que_significa_que_los_derechos_humanos_son_universales_e_inalienablesnbhbi.pdfIn PDF document text
    • http://mailedflkf.site/lomejazanevejen4bdl.pdfIn PDF document text
    • http://luziniwanemek.sportsontheweb.net/nordictrack_act_commercial_10_reviews.pdfIn PDF document text
    • http://repair-kompov.ru/c4elink_music_appreciation_final_examn9g93.pdfIn PDF document text
    • http://tofotibuwul.sportsontheweb.net/47077868495.pdfIn PDF document text
    • http://safetymirrors.xyz/zunizuzusajopofanekaper88owq.pdfIn PDF document text
    • http://wurilozi.scienceontheweb.net/advanced_excel_course_in_hindi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuxalonitu.onlinewebshop.net/40292215885.pdfIn PDF document text
    • https://d03ec42c-8b93-48d3-a61e-9aee396c0db4.filesusr.com/ugd/1e557c_d1abbb98bc8a48a8a89398478766626a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/76739672834.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d681d867-d565-41d3-803a-bc25fab39bc4/82208773236.pdfIn PDF document text
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_1a469bde4ca64df791d6f3b7428c4d62.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bb14be9-cf6d-4333-b6dd-298872c7dbf6/a_streetcar_named_desire_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/67800064060.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ae5cb26-62fa-47c2-b893-2acfd61cd4d2/veterinary_technician_schooling_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76ccdb5e-bfcf-4338-9167-9fd954e2aaa4/36066950676.pdfIn PDF document text
    • https://s3.amazonaws.com/wemupajese/25480085783.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/dararuporavozinikanot.pdfIn PDF document text
    • http://rofuvawitarul.atwebpages.com/25351724090.pdfIn PDF document text
    • https://0ea28b16-58c2-472d-b6be-3e97fe9b7bb6.filesusr.com/ugd/696b8a_fb1069e4dc1842d1b3c45f60774d578a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef2a63e5-5eb8-4f87-b510-810ecb6b39c4/why_is_my_cart_battery_light_flashing.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_off0000e7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C0 5656 bytes
SHA-256: f2df5dc094b772d98070bb020366cf7813353e863449ade9654407fa41d07728
font_01_sfnt_off0000fac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC7 11208 bytes
SHA-256: 544456c30f6996b956391945cf1fe2d871fe98265c650cbdbc32694e9a5cff36