Malicious PDF — malware analysis report

Static analysis result for SHA-256 73f273547411558d…

MALICIOUS

PDF

77.7 KB Created: 2021-02-26 08:50:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 22ef7619cb183d2e945086f979bd90b9 SHA-1: cdc1ab2d3186dc415f586957147eaf25f3f6e9be SHA-256: 73f273547411558df7ffc04bf1cb854fa71c254d05e3ccde10f1a0ba2c51009b
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' strongly indicate malicious intent to lure users to external sites. While no scripts were extracted, the presence of numerous links and the ML classifier's high confidence suggest this document is part of a larger malicious campaign, likely spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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=fender+mustang+lt25+guitar+amp In PDF document text
    • http://leninuludobodu.mygamesonline.org/63316677998.pdfIn PDF document text
    • http://ca-management.website/c5_envelope_die_cut_templateacywy.pdfIn PDF document text
    • http://trynutra.shop/60078771487kcgjm.pdfIn PDF document text
    • http://studytogether.fun/ufed_physical_analyzerkjruj.pdfIn PDF document text
    • http://vipadobotisituz.mygamesonline.org/why_mars_and_venus_collide_sinhala_translation.pdfIn PDF document text
    • http://appletopshop.ru/the_odyssey_study_guide_questionsm79oc.pdfIn PDF document text
    • http://damalakin.22web.org/aprender_ingles_brincando_online_gratis.pdfIn PDF document text
    • https://rasisepuwefu.weebly.com/uploads/1/3/4/6/134678142/terojekarujabibazap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dedinavesute/wegitaz.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/honeywell_barcode_scanner_manual_1900.pdfIn PDF document text
    • https://s3.amazonaws.com/juvosi/28610716392.pdfIn PDF document text
    • https://s3.amazonaws.com/musokejixami/maco_labels_template_30_per_sheet.pdfIn PDF document text
    • http://www.andertons.co.uk/guitar-dept/electric-guitar-amps/amps/fender-mustaIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE653 5264 bytes
SHA-256: 48a5b9d85be4a93d459e1a79b569116988e7796f05f407e244951ce6a64af083
font_01_sfnt_off0000f815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF815 10476 bytes
SHA-256: 069ff592b2c7c2fb1cd59de5e12c62edc8340fbdbd51bc553d76707bd8b51a1b
font_02_sfnt_off00011bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF0 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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