Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b1b493bbf0d461…

MALICIOUS

PDF

75.9 KB Created: 2021-02-24 22:48:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1d8718d3759fa74a8806b42631e82504 SHA-1: 89741286fe2f979acc668c3532052cc0dd6b0c76 SHA-256: 51b1b493bbf0d461426a7b2002fdcb1d63235da51f7b1dee893ce7221468c30f
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to benign-looking PDFs but some point to unknown or potentially malicious domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or SEO spamming operation. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/strik?utm_term=what+forms+rock+strata PDF link annotation
    • http://lololoj.sportsontheweb.net/second_grade_2nd_grade_measurement_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/gggzHjf/hollywood_story_fashion_star.pdfIn PDF document text
    • https://cdn.sqhk.co/farosexuto/FggBYdQ/plague_inc_dna_cheat_apk.pdfIn PDF document text
    • https://wizisenax.weebly.com/uploads/1/3/4/3/134320615/1562130.pdfIn PDF document text
    • https://cdn.sqhk.co/nomazotesi/Jge17sn/racing_war_games_ps4_free.pdfIn PDF document text
    • http://rajenajodaf.iblogger.org/what_type_of_battery_does_apple_tv_remote_take.pdfIn PDF document text
    • https://xoxefalumigak.weebly.com/uploads/1/3/4/5/134527234/c4259a8e.pdfIn PDF document text
    • http://rigoditibalun.mywebcommunity.org/87835108134.pdfIn PDF document text
    • http://veruvipavopa.getenjoyment.net/the_merry_adventures_of_robin_hood_chapter_4_summary.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/zubata/watesisenenufipoti.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/jobuvitonokovagovumo.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/47676689248.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/zavefuvapibud.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/archenemies_online.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/84325054795.pdfIn PDF document text
    • http://giduwenodi.epizy.com/how_to_know_if_you_are_intj.pdfIn PDF document text
    • http://zuwolum.rf.gd/guzivopegesuzov.pdfIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/23621986201.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_off0000ee2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2A 5168 bytes
SHA-256: b20d4edf197bef3e8b98f4558f4026fa206bed28802d9ef064cd84a39fa0fa18
font_01_sfnt_off0000ffa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA1 10260 bytes
SHA-256: f3df4db6b78c60fd84ee6c14815219ef825ffa169433f5a38677d6dc1d0febff

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