Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66da36d698e26d3…

MALICIOUS

PDF

77.1 KB Created: 2021-02-26 22:23:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: ecaa72b30372e5e71d62d4e10ccb6805 SHA-1: 145fb21f3595083a2c39ab7cb71fc6eaf5a1ae5d SHA-256: b66da36d698e26d30c7f3a6249429984c31c552cb82737e0a74436a3a46e1224
186 Risk Score

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://xajibur.ru/wb?keyword=learning%20spoken%20arabic%20language PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366399/normal_5ff031ab6e570.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454432/normal_602c68ee26d08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486748/normal_600ae5a368501.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370267/normal_6011e0700bd14.pdfIn PDF document text
    • https://nusoselif.weebly.com/uploads/1/3/4/4/134470887/b78b90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481999/normal_5fda05f168b53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464539/normal_5fe7dd1f74c2f.pdfIn PDF document text
    • http://telemprom.xyz/nikon_d5300_manual_focus_videoj9ba6.pdfIn PDF document text
    • http://pasendapp.online/33843646813nwewj.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/rovuweraja/callistemon_salignus_violet_rose_form.pdfIn PDF document text
    • https://s3.amazonaws.com/xapota/adobe_photoshop_7._0_hair_brushes_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/aronchupa_video_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/19035188860.pdfIn PDF document text
    • http://zudosikewemer.epizy.com/21446334403.pdfIn PDF document text
    • http://juruzozesema.epizy.com/how_do_atoms_join_together_to_make_different_substances.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_off0000efa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA8 5244 bytes
SHA-256: 34ac681ac3671caa37956824cadc923a1d19f17bd2daa068422102b43e4bea04
font_01_sfnt_off00010190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10190 10776 bytes
SHA-256: c1315c611e8f27ac2283d381652570250fd8d561c86e279fb160f907b5e6ca58