Malicious PDF — malware analysis report

Static analysis result for SHA-256 de181a993b79d305…

MALICIOUS

PDF

69.9 KB Created: 2021-02-20 02:25:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 0b9943e0799c80b28bb2793c4742ece1 SHA-1: 4555a0e6131a533057db6cc571689170636fdfdb SHA-256: de181a993b79d30587c79943e2713b9e33c674512cf713fd437f7165810742a9
96 Risk Score

Malware Insights

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

The PDF document contains numerous external links, with a primary URL designed to mimic a search result for a specific book title. This suggests a link farm or SEO spamming operation. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs supports the attack pattern. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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://seumenha.ru/wix?keyword=shadow+music+julie+garwood+pdf PDF link annotation
    • https://wosodaguv.weebly.com/uploads/1/3/4/5/134590300/9195268.pdfIn PDF document text
    • http://ru-order-687646765445.art/serawgb7mo.pdfIn PDF document text
    • http://rifikelatukuw.iblogger.org/what_does_physical_and_mental_stamina_mean.pdfIn PDF document text
    • https://pabekebu.weebly.com/uploads/1/3/5/9/135990513/lidepibudobu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://residarifuwus.rf.gd/78192032159.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/lauryl_glucoside_technical_data_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/custom_bootstrap_theme.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/raid_5_degraded_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/pathala_bhairavi_tamil_movie.pdfIn PDF document text
    • http://xuguriganuzako.epizy.com/smart_ka_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/android_application_defined.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/penukod.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/effective_public_speaking.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_off0000d6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CF 5840 bytes
SHA-256: 281218110447971ab87143684b98595e1d460993ea5e6ce2da42c9201bea1dad
font_01_sfnt_off0000ea9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9E 9532 bytes
SHA-256: 4ca2bf59bf254afe619e94274fb728d5f6c6d1504317d3b35e76dd35b4d5f83b