Malicious PDF — malware analysis report

Static analysis result for SHA-256 7be3c557c9bc2763…

MALICIOUS

PDF

72.2 KB Created: 2021-03-15 08:00:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 2cd4aa202fa2f9a522a3869d98311e34 SHA-1: 5b0106bf8d68e952e3e36df0f371decb23bb19a7 SHA-256: 7be3c557c9bc2763d475d37add7199e067d68e28df08ce3401401ac4165cb5a3
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to suspicious domains and are likely part of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan distribution attempt. The embedded URLs are the primary indicators of compromise, suggesting the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wb?keyword=how%20to%20setup%20a%20tp-link%20wifi%20powerline%20extender In PDF document text
    • https://cdn.sqhk.co/dodagirojep/hfggDhg/100_games_in_one_box.pdfIn PDF document text
    • https://tobevasisutigi.weebly.com/uploads/1/3/0/8/130814636/rekepavi.pdfIn PDF document text
    • https://cdn.sqhk.co/fugovigul/cCGgfsS/financial_times_covid_economy.pdfIn PDF document text
    • http://sadinexiwa.mygamesonline.org/husqvarna_445_chainsaw_repair_manual.pdfIn PDF document text
    • http://pefiworawodud.mypressonline.com/55947748570.pdfIn PDF document text
    • http://minesaxofunawi.getenjoyment.net/the_hollow_bistro_menu.pdfIn PDF document text
    • https://cdn.sqhk.co/zegegajugot/4XiblZS/hearthstone_meta_report_august_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/tobamozusaj/Z2jhjgL/sogurabixukunujolejep.pdfIn PDF document text
    • http://jivusibofonefud.mygamesonline.org/nsc_defensive_driving_course_coupon.pdfIn PDF document text
    • https://zedifetizigofup.weebly.com/uploads/1/3/5/3/135393349/8323170.pdfIn PDF document text
    • https://lorolefe.weebly.com/uploads/1/3/1/8/131871725/564600.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/kalanejaxutilif/lil_wayne_duffle_bag_boy_remix.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/23771164983.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/demonstrative_pronouns_worksheets_grade_2.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/wedejumevu.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/igneous_rock_worksheet_4th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/99193836853.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_off0000d888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD888 5252 bytes
SHA-256: 797ff81fb7d4e96995a245a299c4881549292f1680a3d6df328b2d343054d22c
font_01_sfnt_off0000ea8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8F 11524 bytes
SHA-256: e2b021f720ef317f70fc30618ca61e431e61d38e569e13a7f9512505094b329f

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