Malicious PDF — malware analysis report

Static analysis result for SHA-256 31ca0a42a1c9fe8d…

MALICIOUS

PDF

83.1 KB Created: 2021-04-04 21:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 49ca18084277281a8ad92529731f0e2b SHA-1: e838488d65621bb529ed83835f48ff29ea76f9a5 SHA-256: 31ca0a42a1c9fe8df9c81c806a877129b0552832c6cb033bab6919b0691ea67e
206 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. It uses a cloud-document share lure. 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 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://bologen.ru/aws?utm_term=what+is+knowledge+base+in+psychology PDF link annotation
    • https://cdn.sqhk.co/melipetoluf/jfhlihN/analisis_foda_de_coca_cola.pdfIn PDF document text
    • https://cdn.sqhk.co/xawobovuji/0dgejfb/pinata_store_los_angeles.pdfIn PDF document text
    • https://cdn.sqhk.co/zatufora/hhGJvic/pevuradoboluvixa.pdfIn PDF document text
    • https://cdn.sqhk.co/rudixika/yzhejgh/busadusijariwidoteri.pdfIn PDF document text
    • http://tigafik.mygamesonline.org/delegation_of_authority_letter.pdfIn PDF document text
    • https://cdn.sqhk.co/pobopuwubox/highOjd/88000747101.pdfIn PDF document text
    • http://lozejebivo.scienceontheweb.net/pexaxemobekesatul.pdfIn PDF document text
    • http://neridofufuleteg.scienceontheweb.net/sinixazivima.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xijewixevav.onlinewebshop.net/26101835341.pdfIn PDF document text
    • https://41be308f-8a64-4dec-8b30-4937605be974.filesusr.com/ugd/f042fe_d8375f6a0295497394ce4bc6a3f39ff6.pdf?index=trueIn PDF document text
    • http://pejulok.epizy.com/anarchism_ideology.pdfIn PDF document text
    • http://luxolonowo.rf.gd/design_agency_company_profile.pdfIn PDF document text
    • http://zokaramizixa.atwebpages.com/anhydrous_ammonia_msds.pdfIn PDF document text
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_9127f8b7f23541a0bc7892f46c9a4d25.pdf?index=trueIn PDF document text
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_a6c713856700483ab5eec027bea63e11.pdf?index=trueIn PDF document text
    • http://xogaduzop.atwebpages.com/mario_castelnuovo_tedesco.pdfIn PDF document text
    • http://dasobiviwadodaj.atwebpages.com/lsa_international_internships.pdfIn PDF document text
    • http://padadubijimesib.epizy.com/kinovasobun.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_off000104ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EF 5652 bytes
SHA-256: 32b2fec023af7bbd2dd45ed0982d32715a635146deaa593ad526f7eb7db48d95
font_01_sfnt_off00011844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11844 11412 bytes
SHA-256: 59e545585b6e026f0e9bac28d01f3576f183450a2a1438a55fb6aec682687e42

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