Malicious PDF — malware analysis report

Static analysis result for SHA-256 d35b8665a0581e40…

MALICIOUS

PDF

81.1 KB Created: 2021-02-27 04:16:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a6421562cfb066f7a4e56b2c0d06dbfc SHA-1: 2bc375ebc52a5596a2fb260b87cb77e75b4dfc78 SHA-256: d35b8665a0581e40366988b993ab306be2805925a34995dad88a479e7881068b
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, mentions 'wifi hack tool apk free download', suggesting a lure for potentially unwanted or malicious software.

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://kuzutuzo.ru/wix?keyword=wifi+hack+tool+apk+free+download PDF link annotation
    • http://betmoy54.com/stylish_fonts_download_app08516.pdfIn PDF document text
    • http://1gusevshop.space/862712555418n5r.pdfIn PDF document text
    • http://g2am2e.xyz/equation_of_tangent_to_a_circle_worksheet66s7p.pdfIn PDF document text
    • http://businessoutsourcing.info/steel_construction_manual_13th_editiv1bu4.pdfIn PDF document text
    • http://b4shop.icu/kikagajar8psnx.pdfIn PDF document text
    • http://mumolazesinidix.getenjoyment.net/do_not_pray_for_easy_lives.pdfIn PDF document text
    • http://gebuhrenfrei-mein.com/what_is_relationship_between_china_and_taiwanah1wr.pdfIn PDF document text
    • http://koolmaxt.online/30344835498resl3.pdfIn PDF document text
    • http://likedizar.medianewsonline.com/75517035939.pdfIn PDF document text
    • http://veronaital.space/6120106399700ucv.pdfIn PDF document text
    • http://item-mask.top/duritapumuzumif3a1p.pdfIn PDF document text
    • http://1offpark.xyz/android_bottomnavigationview_always_show_textxdr0f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rosajeku.myartsonline.com/princess_bride_movie_free_online_full.pdfIn PDF document text
    • http://kakasis.onlinewebshop.net/a_series_of_unfortunate_events_star_cast.pdfIn PDF document text
    • http://pumatelikowe.epizy.com/fadize.pdfIn PDF document text
    • http://keberugut.epizy.com/78463934958.pdfIn PDF document text
    • http://fabodatutowew.epizy.com/17832692762.pdfIn PDF document text
    • http://jogufek.epizy.com/how_do_i_program_my_directv_remote_to_rf.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_off000101e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E7 5236 bytes
SHA-256: 4d4e22e903602ea2d8cc6dec11f604acb11ca1e15307ff86579dd0db9bf5e3b9
font_01_sfnt_off000113ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CE 10308 bytes
SHA-256: 6fbf0643bc0152f895eaffcd2cfe3b1048e45831897b4be0c9dc052fabe1fbd7

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