Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf3c115fcaea806c…

MALICIOUS

PDF

130.5 KB Created: 2021-03-17 03:33:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 756423d4b8dd49bc390baa20f1d33677 SHA-1: ea4063cb19d9f4dbae36213452c90e8ead8a7e42 SHA-256: bf3c115fcaea806c2b42c55ef957a93a58ac2140fee83ad187d9e05fa52df65f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/strik?utm_term=adam+smith+la+riqueza+de+las+naciones+an%25C3%25A1lisis PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389394/normal_60505b303d0f6.pdfIn PDF document text
    • http://makebugobiwuka.mypressonline.com/pekukagugovivifew.pdfIn PDF document text
    • http://sefegusekepuxa.mypressonline.com/zaxewinerenuxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454049/normal_6009e15b6b3e3.pdfIn PDF document text
    • http://nemosixumeki.mypressonline.com/12022362495.pdfIn PDF document text
    • http://nakozek.mypressonline.com/nuwilavexisasejulazeme.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488102/normal_5fcc9b549c088.pdfIn PDF document text
    • http://medemukiduba.sportsontheweb.net/student_information_management_system_project.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487399/normal_5fd262673cd3b.pdfIn PDF document text
    • http://lapitubemexidi.mywebcommunity.org/yahoo_fantasy_football_cheat_sheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lolunoxij.myartsonline.com/small_scale_business_ideas_in_africa.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/82872994952.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/free_ad_blocker_for_android_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bf345cb-0724-4379-887e-77f20b6bc5c0/kaviruwegetijafa.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/madness_combat_10_sprite_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c34f480b-c659-4910-90d5-cefbd0842f9a/harry_potter_lego_castle_71043_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa32fa96-1590-456b-bdc3-39d1b1d0c2cf/35647732678.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/437c75a8-c2b0-45dd-a4a0-39b170f12dff/global_marketing_keegan_green.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad750489-a900-429f-87d9-d2c465a97fc2/nupomafuriwesumikotakuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abf3d740-1cc3-45ac-92b6-d246ea2e549c/434133001.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8558f945-7c83-40cd-81de-67d02a28e684/80631303563.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/18_movies_2018_bollywood_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fb1784d-7c2c-44a4-8167-be8bbf1c222d/whirlpool_quiet_partner_3_dishwasher_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d1e8938-47f8-4a28-908e-31d6f9558855/turning_profit_into_cash.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_off0001be93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE93 5576 bytes
SHA-256: f3a9babeb078bb4d1a6ed314c95080bd4a93a0af1e9990d6234ba812fc00060e
font_01_sfnt_off0001d0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D0D6 12480 bytes
SHA-256: 471c132f06cbe49807877e68fda53e86b04dd728b3b00ba65bb24fa3cd1f782d