Malicious PDF — malware analysis report

Static analysis result for SHA-256 7273760dcfcfdf7c…

MALICIOUS

PDF

76.4 KB Created: 2021-04-01 22:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 54e3280a38ba0a761e258be95c614cd5 SHA-1: a207769e8c29bf08d51e7ae1b40db378068b35fd SHA-256: 7273760dcfcfdf7cd1dbe07f22d9a842c7fdcb55252732b5c3cccb6d9cddb06a
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 heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, and the presence of external URIs suggests an attempt to redirect the user. While no scripts were explicitly extracted, the nature of the URLs and the ML detection strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://soxebez.ru/123?utm_term=red+wine+temperature+storage+guide PDF link annotation
    • http://gagapazu.scienceontheweb.net/journal_of_agricultural_and_food_chemistry.pdfIn PDF document text
    • https://cdn.sqhk.co/wofazexej/ehcFhji/mabapakagegen.pdfIn PDF document text
    • http://fusobilel.iblogger.org/geometric_shapes_3d.pdfIn PDF document text
    • https://cdn.sqhk.co/kinemefuwa/BSTjih0/laniwapubivonilefaf.pdfIn PDF document text
    • https://cdn.sqhk.co/sixepatexup/chbfggl/netflix_series_virgin_river_how_many_seasons.pdfIn PDF document text
    • https://cdn.sqhk.co/zaborofisi/hb01YS4/58722825629.pdfIn PDF document text
    • https://cdn.sqhk.co/mofosalamo/jijizuk/zadibu.pdfIn PDF document text
    • https://cdn.sqhk.co/bimonabozo/CjbjevK/2048x1152_minecraft_pic.pdfIn PDF document text
    • http://rebezun.mygamesonline.org/zaganak.pdfIn PDF document text
    • http://lekoxaxe.22web.org/jukajovixe.pdfIn PDF document text
    • https://cdn.sqhk.co/gukawaki/hiigpij/ieee_journal_of_lightwave_technology_template.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/bomifabipi/sitiralowega.pdfIn PDF document text
    • http://sozazavore.rf.gd/gmat_unofficial_score_report_sample.pdfIn PDF document text
    • http://junaken.onlinewebshop.net/cardinal_number_of_a_set.pdfIn PDF document text
    • http://rozopujonabesix.epizy.com/algebra_2_practice_workbook.pdfIn PDF document text
    • http://wolixebob.rf.gd/19492337476.pdfIn PDF document text
    • https://s3.amazonaws.com/dazutun/cutting_edge_advanced_teacher_s_resource_book.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/11522680638.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/what_are_the_economic_activities_in_nigeria.pdfIn PDF document text
    • http://tujatubaniza.epizy.com/jofogi.pdfIn PDF document text
    • http://fudejavifexas.epizy.com/tupinetenilerudejobakun.pdfIn PDF document text
    • http://najukelosuned.myartsonline.com/tisorukafotivodobo.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_off0000ecf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF0 5348 bytes
SHA-256: 650760f522bb4ae803544803fe02130c4971800bdb74a71f1ab6fc9aa2f6367a
font_01_sfnt_off0000ff1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1C 10748 bytes
SHA-256: 1409bd776633d09163b0ddb6289061ba6fc4fa4c6a46c3d8794eeb11c645b444

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