Malicious PDF — malware analysis report

Static analysis result for SHA-256 197a590f03f53d5b…

MALICIOUS

PDF

83.9 KB Created: 2021-04-04 01:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 449d3ca745c4ac0cb78ff1a0a996d634 SHA-1: 931aca74ee0008ed214c6e004620bc19a93f0abd SHA-256: 197a590f03f53d5b4ad23b6915b69ec85fc5090b85ba1f44312879fd80dc95a5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically targeting 'washington dc covid testing pcr', suggesting a phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, further supporting a malicious intent to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/strik?utm_term=washington+dc+covid+testing+pcr
    • https://cdn-cms.f-static.net/uploads/4385852/normal_604dd4ba184f0.pdf
    • https://cdn-cms.f-static.net/uploads/4489257/normal_601d003712267.pdf
    • https://cdn.sqhk.co/xuxiropuwomo/EdhjijQ/alice_in_wonderland_runner.pdf
    • http://usechambre.xyz/luxifenae0yzx.pdf
    • http://1pokypki.website/how_to_set_tax_on_casio_pcr-t273bzh9l.pdf
    • http://zuzimosutikume.22web.org/novomokaxejanab.pdf
    • https://cdn.sqhk.co/juzosugun/fhPrWgh/lyft_driver_support_customer_service_phone_number.pdf
    • http://metinozub.iblogger.org/87081754023.pdf
    • https://cdn-cms.f-static.net/uploads/4406514/normal_60370479c09b3.pdf
    • https://cdn.sqhk.co/fogibadeku/Xhi2jdK/alpha_guns_mod_apk_download_for_android.pdf
    • http://mxbur.fun/e_district_odisha_caste_certificateetboz.pdf
    • https://cdn-cms.f-static.net/uploads/4459166/normal_604795919e764.pdf
    • http://kalavar.xyz/83860916345ozfo3.pdf
    • https://static.s123-cdn-static.com/uploads/4369164/normal_5fef9449b8c75.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zedotedifajo.epizy.com/ain_t_it_funny_song.pdf
    • https://s3.amazonaws.com/palikuvexake/q-see_iphone_app_download.pdf
    • http://zakizil.rf.gd/55633336859.pdf
    • https://uploads.strikinglycdn.com/files/0de86160-a37e-47ea-a266-952cf9c2b057/35999562478.pdf
    • https://s3.amazonaws.com/sikuva/vimilinoduxadumurutasad.pdf
    • http://varupijijajeb.rf.gd/89673948448.pdf
    • https://uploads.strikinglycdn.com/files/33a62825-3511-4795-8a8e-34bb85445b9a/rinodoxedupare.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010aea.bin
95352be545d43f3cfad3494bbdffe95a1bf7d6a88c01f17324a1cfc42dd8e6de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEA 5376 bytes
font_01_sfnt_off00011d41.bin
a8f724f33ff5dd71f36ec21f292cbd1571fab8d3a8cc7e77f668061f4582abab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D41 11056 bytes

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