Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a7f54cca1f4792f…

MALICIOUS

PDF

98.7 KB Created: 2021-03-24 20:20:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 31fcec96c6323d99d059aca8837f9e2e SHA-1: 7a140db2f8634979f58d5f4d193cc17906d7c06f SHA-256: 1a7f54cca1f4792f4fbaf247c7804484dddc086ecab823d8572a05d77af55557
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, with many pointing to disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or SEO spam. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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 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.
  • 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/strik?utm_term=taylormade+r15+3+hybrid+review PDF link annotation
    • https://cdn.sqhk.co/xinosemu/hPFje3w/tigini.pdfIn PDF document text
    • http://yewes.space/yamaha_rx-v667_service_manualgnvvm.pdfIn PDF document text
    • http://lofajemami.sportsontheweb.net/what_are_the_specials_at_subway_today.pdfIn PDF document text
    • http://wide-do.top/92735576695682wy.pdfIn PDF document text
    • http://xepelewatelaziv.getenjoyment.net/15925652890.pdfIn PDF document text
    • https://cdn.sqhk.co/fapewakuw/icgdJgi/beauty_routines_of_celebrities.pdfIn PDF document text
    • http://kafujaguvo.mygamesonline.org/how_to_know_my_motherboard_win_10.pdfIn PDF document text
    • http://dekovag.mypressonline.com/ano_ang_migrasyon.pdfIn PDF document text
    • http://in-arenas.com/how_to_write_an_essay_introduction_outline68ydu.pdfIn PDF document text
    • https://cdn.sqhk.co/tenokesime/XWidnhc/logan_pottery_barn_bedside_table.pdfIn PDF document text
    • https://cdn.sqhk.co/tavevalurov/6ibhigg/stretches_for_flexibility.pdfIn PDF document text
    • https://cdn.sqhk.co/bagekaketox/eifnDjh/81482529137.pdfIn PDF document text
    • http://vitrinachel.ru/17049360068ux61v.pdfIn PDF document text
    • https://cdn.sqhk.co/wogirujut/jCiqihh/how_to_bake_sweet_potatoes.pdfIn PDF document text
    • http://finomimetafix.sportsontheweb.net/miluxovudujemutanopusu.pdfIn PDF document text
    • http://dihtyar.online/what_is_the_five_point_likert_scaleosy8m.pdfIn PDF document text
    • https://cdn.sqhk.co/zapimafe/YMo9Uhg/tufivotilakiperifobologub.pdfIn PDF document text
    • https://cdn.sqhk.co/dawadetugas/igFXijb/dora_saves_the_crystal_kingdom_wii_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://13ea8442-998f-4f14-ba3b-7f37e53a414c.filesusr.com/ugd/008a9f_240fbcd1180942c9a0fe7538a379949e.pdf?index=trueIn PDF document text
    • https://ec560393-4650-4708-bf0c-d08fceb8458c.filesusr.com/ugd/ca69db_335049c270524f78b68adff4575dfba3.pdf?index=trueIn PDF document text
    • http://vivetusukuv.onlinewebshop.net/prevention_of_food_adulteration_rules.pdfIn PDF document text
    • https://c63359c4-faa5-40af-ad11-254ddd3d100c.filesusr.com/ugd/838c33_2ab5f0e822c7460c92b7c78392aac815.pdf?index=trueIn PDF document text
    • https://6a421494-2577-4416-904f-e17348f56b63.filesusr.com/ugd/85e76a_84f4f46ff60c4f1f8735afd7a01ec971.pdf?index=trueIn PDF document text
    • https://b7e73dfe-ad35-4791-b4f7-7500f5b7882c.filesusr.com/ugd/bc79a4_5ca62671a42045a4bba168661224f436.pdf?index=trueIn PDF document text
    • http://wufagezigedo.onlinewebshop.net/marketing_research_an_applied_approach_malhotra.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE6 5568 bytes
SHA-256: c06c9e5b97578534998870141c5e914c9e545e47ed877a6ea056a6da54b04474
font_01_sfnt_off000140c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140C6 11252 bytes
SHA-256: ed4b33767951bb1894e0f0f6b9a8953007aa61c870e230ad1856de478f46deb3
font_02_sfnt_off00016764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16764 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501