Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9b9f52cf352d91d…

MALICIOUS

PDF

84.4 KB Created: 2021-03-30 16:41:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 060f08e5e7f0454ef5e2475ae0d00bde SHA-1: 8d42db1e525a112493b3d38fd6ce08c9e7d12472 SHA-256: f9b9f52cf352d91de31b5b35e020a1049583b2decc8ae8d9ba5af7a18680ea93
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 0.9998

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://xezojetit.ru/wix?keyword=the+future+of+the+mind+summary+pdf PDF link annotation
    • http://atelier-spb.com/how_to_write_a_cfg_file_in_pythonfxxdh.pdfIn PDF document text
    • https://cdn.sqhk.co/fofodafexadu/2gJ0MTT/22657255527.pdfIn PDF document text
    • http://jerimujolegem.medianewsonline.com/22205210563.pdfIn PDF document text
    • https://cdn.sqhk.co/litonesi/xic7Pie/96876203753.pdfIn PDF document text
    • http://jivusibofonefud.mygamesonline.org/piruteroledivevuwin.pdfIn PDF document text
    • http://flowerport.shop/cannon_safes_at_academyudph1.pdfIn PDF document text
    • http://rollernefritmassage.xyz/zonijipolopujawofijovipowltxl0.pdfIn PDF document text
    • http://tehnotop.space/32655938083vvip7.pdfIn PDF document text
    • https://cdn.sqhk.co/rabuzopat/biipgh8/amc_theater_showtimes_today.pdfIn PDF document text
    • https://cdn.sqhk.co/disanefamu/jbhema4/30283276489.pdfIn PDF document text
    • http://makedctl.site/2013_dodge_charger_police_0-609eoj4.pdfIn PDF document text
    • http://jolixasij.sportsontheweb.net/platos_apology_of_socrates_an_interpretation_with_a_new_translation.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://putojoner.rf.gd/concrete_grade_and_mix_ratio_table.pdfIn PDF document text
    • http://juxitogepamuwo.epizy.com/48557645675.pdfIn PDF document text
    • http://febuzoremasovev.epizy.com/48199039258.pdfIn PDF document text
    • http://sazebufaz.atwebpages.com/54538993908.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/kraftmaid_cabinetry_specification_guide.pdfIn PDF document text
    • http://tutufot.rf.gd/human_anatomy_books_in_tamil.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_off00010781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10781 5300 bytes
SHA-256: 13e6b65bc1f0939ad8369dca1044c846b6e3b36d9260f303bb469d9d30a875b0
font_01_sfnt_off00011966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11966 12464 bytes
SHA-256: 74e88a67562ba3afba28855a7abd4c882b1790d1a667ba2d93f9a92d501c40c4