Malicious PDF — malware analysis report

Static analysis result for SHA-256 22b91851e217c21f…

MALICIOUS

PDF

94.7 KB Created: 2021-06-08 09:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8a13370bfacf968979fc0f428bbc5bc2 SHA-1: 5ad6d86351072a2b4a1c6e75b75a20b7c27bb069 SHA-256: 22b91851e217c21f674c4e33b47cc4692e1010be2782eaaf8f18a37c1bdb405b
186 Risk Score

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://smidgel.ru/pbw?utm_term=nice+guidelines+diabetes+algorithm PDF link annotation
    • https://zagavodemutiza.weebly.com/uploads/1/3/0/8/130814258/e08c8f39c18c7b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529977/normal_60128cf9a52ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446773/normal_5ffcd57511136.pdfIn PDF document text
    • https://webapifupa.weebly.com/uploads/1/3/4/7/134706955/5143101.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419211/normal_5fedcde010bd3.pdfIn PDF document text
    • https://terarawuterojuz.weebly.com/uploads/1/3/0/7/130739827/dirinonof.pdfIn PDF document text
    • https://xonarupitowij.weebly.com/uploads/1/3/4/6/134617661/5878226.pdfIn PDF document text
    • https://safamitiwifiro.weebly.com/uploads/1/3/0/7/130739579/dabofisege_meboxusuwaguv_xemas_zetoxisop.pdfIn PDF document text
    • https://bikanagika.weebly.com/uploads/1/3/4/4/134461715/fopawexozovu.pdfIn PDF document text
    • https://zusadadej.weebly.com/uploads/1/3/4/8/134856209/lesexenazotadekaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393188/normal_6003c25ddc37e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367633/normal_5fe6c6fd812fe.pdfIn PDF document text
    • https://muvaxajipafe.weebly.com/uploads/1/3/5/3/135313420/zigipi_kimar_zeseb_fitafupizuteke.pdfIn PDF document text
    • https://nenuxigibasus.weebly.com/uploads/1/3/4/6/134694542/podubire_bakovorepakav_napezab.pdfIn PDF document text
    • https://lonojoxojiliw.weebly.com/uploads/1/3/1/4/131438577/6085777.pdfIn PDF document text
    • https://lulakoxefinadi.weebly.com/uploads/1/3/4/3/134332070/jatotoxezorox-vorelizekusori.pdfIn PDF document text
    • https://buxevuforuwax.weebly.com/uploads/1/3/2/6/132680831/3d2c8c096d1003.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://goxuluk.pbworks.com/w/file/fetch/144655500/10076617808.pdfIn PDF document text
    • http://jozeluwofe.pbworks.com/f/janopo.pdfIn PDF document text
    • http://najajadux.pbworks.com/w/file/fetch/144718965/taken_1_full_movie_in_hindi_free_download_hd_720p.pdfIn PDF document text
    • http://nilanom.pbworks.com/f/80118473752.pdfIn PDF document text
    • http://nagomax.pbworks.com/f/does_illinois_allow_religious_exemption_for_vaccines.pdfIn PDF document text
    • http://magobok.pbworks.com/f/administrative_law_in_bangladesh.pdfIn PDF document text
    • http://letonepamusi.pbworks.com/w/file/fetch/144717021/bsc_mathematics_notes.pdfIn PDF document text
    • http://sozakuvepar.pbworks.com/w/file/fetch/144517413/79746146502.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000127b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B9 5344 bytes
SHA-256: 3af93451e7b7a5faa6238fb55fcd1a8ce3ada84529be1206005d5eb33cd449a5
font_01_sfnt_off000139ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139AB 11036 bytes
SHA-256: 37d491a5e3cfa72d068b66586a37e115df67577186eb8d23c6b066d4f0f024a0
font_02_sfnt_off00015f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F32 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333