Malicious PDF — malware analysis report

Static analysis result for SHA-256 27cdcf4a486aa573…

MALICIOUS

PDF

80.4 KB Created: 2021-03-05 18:02:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 192716bdcfafa804602d0e91d214661f SHA-1: bb6c00e5dfbcaefea1c0eecbe3cb15c8f6dcae09 SHA-256: 27cdcf4a486aa57367addfb02bf5df9146b73ac48c5902d8bcb3db4d793a3a24
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The primary malicious URL identified is dugedepap.ru, which is likely used to host a second-stage payload or redirect to a phishing site. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dugedepap.ru/strik?utm_term=behringer+xenyx+x1204usb+premium+12-input+2%252F2-bus+mixer+with+usb%252Faudio+interface PDF link annotation
    • https://vemanilulo.weebly.com/uploads/1/3/4/3/134378365/2252909.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417045/normal_602dac6b3010e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380867/normal_5febe4b00d869.pdfIn PDF document text
    • https://butoxuxesadi.weebly.com/uploads/1/3/4/6/134699311/0725fa.pdfIn PDF document text
    • https://leviwajij.weebly.com/uploads/1/3/1/6/131637177/89dd22796.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451551/normal_5ff6a0d7050c8.pdfIn PDF document text
    • https://tugizikorosizo.weebly.com/uploads/1/3/4/5/134502987/jevijenokok_gujonopabusu_logubidor_tekeretul.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/tomamujuf/cheat_seed_minecraft_pocket_edition_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ebc6a60-3477-447a-b5f5-5326abee8d19/unix_bash_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/whatsapp_apps_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1de133fd-6851-4f45-94e4-e4bc1490fbd8/navien_ncb_240_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e4eb624-3f43-44cc-bfd9-ddb1b3b905a4/black_and_decker_coffee_maker_manual_auto_clean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ffb878f-610d-44f2-8fb8-c3883add19bb/how_to_wear_baby_forward_facing_in_ergo_360.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82e00f85-876d-4396-98b6-39a5c16ad05b/how_to_enable_local_area_connection_in_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/java_jre_1._8_0.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7952e7f4-dfd3-41df-8eec-f2a444bc4b88/31867845511.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7eef01c4-8560-465f-8d01-dc3125e3c88a/physics_halliday_resnick_krane_volume_1_solution_manual.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_off0000f739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF739 6472 bytes
SHA-256: 6fba81de83ec9df0f73e15347cf1968b71e9569701e447d98ce085533da04d04
font_01_sfnt_off00010d4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4C 10704 bytes
SHA-256: 17d784159e8c30934edccbea3a1e6507894c705029a7e394e17d1039dc03ec40

Open this report in the interactive analyzer, or submit your own file for analysis.