Malicious PDF — malware analysis report

Static analysis result for SHA-256 d840bf0551ce223a…

MALICIOUS

PDF

85.7 KB Created: 2021-04-30 08:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 7a29f225bf8cbc58682a8456e65a187e SHA-1: 65c86b1862581eaeee5e18ea3f37c676a3eaf814 SHA-256: d840bf0551ce223a4ab96c90b172710af06ebf339fa759c023d66b781d19f946
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and one prominent URL that appears to be a redirector. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this document being used to distribute malicious content or conduct phishing attacks by directing users to external sites. No scripts were extracted, but the overall structure and URL distribution strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://xajibur.ru/strik?utm_term=neverwhere+neil+gaiman+series PDF link annotation
    • http://kobivoweder.mypressonline.com/41414117617.pdfIn PDF document text
    • http://patajafurep.mywebcommunity.org/what_is_the_main_theme_of_the_raven.pdfIn PDF document text
    • http://bimoriz.getenjoyment.net/scag_cheetah_mowers_reviews.pdfIn PDF document text
    • http://dalosizofovabes.medianewsonline.com/kepigigi.pdfIn PDF document text
    • http://paxibokojusaduw.22web.org/a_short_report_on_kerala_flood.pdfIn PDF document text
    • http://pewagupudasita.22web.org/kitti_dataset_annotation_format.pdfIn PDF document text
    • http://sovuradema.medianewsonline.com/xaxebotegewu.pdfIn PDF document text
    • http://kefijor.mygamesonline.org/athlean_x_max_size_reddit.pdfIn PDF document text
    • http://vevebopawo.mywebcommunity.org/hidroxiureia_na_anemia_falciforme.pdfIn PDF document text
    • http://dusejetiwogodad.getenjoyment.net/briefer_history_of_time.pdfIn PDF document text
    • http://muzibatixabu.mypressonline.com/patiwanajemubukobop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dipagepe.atwebpages.com/wizawoperodip.pdfIn PDF document text
    • http://rupesujutiwu.myartsonline.com/36211479006.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c238028-83fd-4f8d-91e1-87d8d763ce89/gilitajexol.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/kufamorujozebajoj.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/latest_selenium_interview_questions_and_answers_for_experienced.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7f7d496-d713-4a55-89ca-a86db775c1d9/75936585897.pdfIn PDF document text
    • http://kubowulurarekij.myartsonline.com/22046166951.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/986b7d1c-cabc-4cb7-9a95-f556d641756b/6451026667.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abb58cff-6289-4220-a86b-fae5eb3f1457/mosalowobebakekis.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/88651569836.pdfIn PDF document text
    • http://dusameferadulo.onlinewebshop.net/dogiminimixid.pdfIn PDF document text
    • http://fekovip.rf.gd/xinonisataxawapopojujir.pdfIn PDF document text
    • http://dajajubofu.rf.gd/descent_2nd_edition_house_rules.pdfIn PDF document text
    • https://s3.amazonaws.com/veledabejufi/doxofakodixuzetosu.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_off00011002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11002 5220 bytes
SHA-256: 352d398d2b0320c741fc3f624bc49ae0a7810ea0c21597bb511049ca6a509392
font_01_sfnt_off000121b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B4 11820 bytes
SHA-256: 088652739d6a0ec9edd06bb4ded53d12cec4c33c655bdf2b0abd62dbad31ecf0

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