Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8898d416ca44eb7…

MALICIOUS

PDF

73.6 KB Created: 2021-05-18 00:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bfd22e1946efb90320fd4fd7b145a88d SHA-1: 156c961d59101b6fd1575dec42c525f03754d0c4 SHA-256: b8898d416ca44eb7dc874f0072d94fe7f8f1d225d111d7176b51ef2f3b80b7e3
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nipisod.ru/strik?utm_term=snake+and+ladder+3d+mod+download PDF link annotation
    • http://mitibazin.22web.org/anaesthesia_for_veterinary_nurses.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380531/normal_5fd37e003bc38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417405/normal_6058024d919da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373755/normal_5fe93ad9b89c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369930/normal_6035d595f094c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420013/normal_60306a389f755.pdfIn PDF document text
    • http://bofinaposo.iblogger.org/xusig.pdfIn PDF document text
    • http://fusitekive.iblogger.org/36130091578.pdfIn PDF document text
    • http://dirujadejefogax.iblogger.org/catalogo_avon_4_2019.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/27900ce2-9c32-49c3-9cea-ef76934596bd/how_to_cite_a_mobile_app_in_apa.pdfIn PDF document text
    • http://gefuxexo.epizy.com/tv_guide_listings_tonight_nyc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb1f26e6-cce0-4f5b-8f5c-f398777ea934/my_neck_hurts_when_i_look_up_and_down.pdfIn PDF document text
    • http://sotemapepuko.epizy.com/american_standard_version_bible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe65dad7-a9e6-4593-82c7-ceb7eb0a3253/gejisabajozesixebigi.pdfIn PDF document text
    • http://zujofogu.epizy.com/network_master_speed_test_app.pdfIn PDF document text
    • http://muduwabu.rf.gd/idoe_course_description_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02076fde-96e9-4d0b-9e35-fec743766759/48232099378.pdfIn PDF document text
    • http://talaxapu.epizy.com/marketing_foundation_for_advertising_and_public_relations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2e34232-f16e-4a39-af6e-12db600608cb/71590790712.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf69aa77-5fef-4562-b230-c27184a43fed/checklist_to_start_a_cleaning_business.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_off0000e2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E5 5216 bytes
SHA-256: 793e80b17b187b26919eae3c1549aa21d2342f5458d846038362f0b18562dc85
font_01_sfnt_off0000f49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49E 10632 bytes
SHA-256: e6efc9dcc6ebbea7c262d905a735816ed65619c6d75213d30c559ac6514d3cbf

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