Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b72570c63dee51f…

MALICIOUS

PDF

68.8 KB Created: 2021-04-02 13:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4efb0ca6533ac01cd7ef07ff508fac64 SHA-1: fbf7eab0ab240c2bea465b5932c1f8aa05e9d3c5 SHA-256: 4b72570c63dee51fb1a51232bf9e2486ed837697c498b47e16c3cb195becb530
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, appears to be related to medical search terms, suggesting a lure for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://yafferge.ru/award?keyword=pathogenesis+of+type+2+diabetes+mellitus+pdf In PDF document text
    • https://lekifusa.weebly.com/uploads/1/3/1/3/131382118/7675607.pdfIn PDF document text
    • https://buzolemego.weebly.com/uploads/1/3/5/3/135393469/93f46809.pdfIn PDF document text
    • http://lajodibibodi.getenjoyment.net/dadadaguzarupi.pdfIn PDF document text
    • https://menanolunum.weebly.com/uploads/1/3/4/7/134754058/f8c1558.pdfIn PDF document text
    • http://gagerovovus.22web.org/d_d_5e_god_wizard_guide.pdfIn PDF document text
    • https://wibawamo.weebly.com/uploads/1/3/1/3/131383294/6694142.pdfIn PDF document text
    • https://luxiwejewukon.weebly.com/uploads/1/3/0/7/130738755/tasukevojifug.pdfIn PDF document text
    • https://sexabadipeg.weebly.com/uploads/1/3/4/6/134684930/1520553.pdfIn PDF document text
    • http://nenodipemuxok.mypressonline.com/popunoralorafemorejaba.pdfIn PDF document text
    • http://modaxosemerevik.22web.org/lunasagid.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/lolijexejomak/free_handwriting_practice_printable_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/gagotaniwipure/how_much_does_a_bowflex_ultimate_2_weight.pdfIn PDF document text
    • http://kaporeko.rf.gd/free_business_card_templates_online.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/china_gate_song_free.pdfIn PDF document text
    • http://futikuzita.onlinewebshop.net/mental_health_essay.pdfIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/42131185999.pdfIn PDF document text
    • http://fasevebozumip.rf.gd/chocolate_warehouse_sale_kota_damansara.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/making_history_the_second_world_war_guide.pdfIn PDF document text
    • http://nononulavojiki.myartsonline.com/the_beekeeper_of_aleppo_download.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_off0000ce85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE85 5736 bytes
SHA-256: 43b3e10fb8aa915054eaa1f2ba5b4d1976600433a1d1dd4c5177bf00a5d9f8e3
font_01_sfnt_off0000e1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F3 9796 bytes
SHA-256: 87d02b3a31057569b6aa9550cf6f8359a39bfbec78418f2060dc530cb175fe1a

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