Malicious PDF — malware analysis report

Static analysis result for SHA-256 37773fc284f7ef4b…

MALICIOUS

PDF

82.4 KB Created: 2021-05-22 13:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1a2cf9dc4414acfe26d354e554679bb5 SHA-1: 5b880f9ce03ac2a0c6b72b4a8c552f4bc99bc5e5 SHA-256: 37773fc284f7ef4b90d3dcfaf772e25385ddf605468881d9199cc3ae041eb568
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 0.9995

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=what+does+the+expression+finger+guns+mean PDF link annotation
    • https://rurusoweloxefug.weebly.com/uploads/1/3/3/9/133989150/dokipasawuteg-memujinafeporib-tugogo-wirimade.pdfIn PDF document text
    • https://zasoliwex.weebly.com/uploads/1/3/5/3/135318241/4721091.pdfIn PDF document text
    • https://dokupikojezox.weebly.com/uploads/1/3/4/7/134740590/vebitixen-vurifo.pdfIn PDF document text
    • https://gidiwukos.weebly.com/uploads/1/3/1/3/131381706/vemisaz.pdfIn PDF document text
    • https://murimuwisoruda.weebly.com/uploads/1/3/4/0/134017177/govof-rajokam-kapubulafinejo-fixejegaju.pdfIn PDF document text
    • https://wutowenejeboz.weebly.com/uploads/1/3/4/5/134599911/lexaxokonukowapi.pdfIn PDF document text
    • https://mavakonagidesa.weebly.com/uploads/1/3/1/4/131483278/dd9d51d9b51e2af.pdfIn PDF document text
    • https://bifuwesulowun.weebly.com/uploads/1/3/4/3/134308915/wuburudadow.pdfIn PDF document text
    • https://dikajumexuw.weebly.com/uploads/1/3/4/3/134324924/feruzezemet-sikazixelalil.pdfIn PDF document text
    • https://nikulagoronol.weebly.com/uploads/1/3/2/3/132303117/9480772.pdfIn PDF document text
    • https://jevijoju.weebly.com/uploads/1/3/5/9/135978445/misep.pdfIn PDF document text
    • https://rogefuza.weebly.com/uploads/1/3/4/6/134688393/1fb0fb43bb9e29.pdfIn PDF document text
    • https://pinozawekik.weebly.com/uploads/1/3/4/5/134589254/a74c7d1dcb13e2f.pdfIn PDF document text
    • https://bamigifumu.weebly.com/uploads/1/3/4/4/134443618/8715088.pdfIn PDF document text
    • https://wagimudo.weebly.com/uploads/1/3/4/4/134475497/vitebojumedudepodaso.pdfIn PDF document text
    • https://kilekefaze.weebly.com/uploads/1/3/4/6/134631798/9c8b3ce4d3.pdfIn PDF document text
    • https://mozepuboxiwagu.weebly.com/uploads/1/3/6/0/136094106/78a4c.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/rovikibixu/vizio_m492i-b2_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e9bd1cd-55d9-4721-9b66-b8252398a40e/is_there_a_difference_between_ssi_and_disability.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14961174-b93a-4e3b-9095-93d37692722d/load_data_analysis_toolpak_excel_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/meal_prep_guide_for_bulking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c1e5b5c-3bd2-4160-91dd-d763dd72dd39/kustom_kpc10m_review.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_off0000f75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75E 5504 bytes
SHA-256: 3164ba892f2a877716227d33204c0894fdea1f1fa6e9b2de35dd7df6a62f0734
font_01_sfnt_off000109fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FB 2328 bytes
SHA-256: 7ea17a3190d72b47eb75ff0c16f938b168281412a4b69c50481ccf9bb4938be0
font_02_sfnt_off0001147f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147F 11040 bytes
SHA-256: 5f6310680296cc6a2cb4c503c15434e5583726c8ce4497388281ef9713919a12