Malicious PDF — malware analysis report

Static analysis result for SHA-256 3773556d53c8693d…

MALICIOUS

PDF

73.3 KB Created: 2021-03-07 16:58:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ea1de88e4089d905e2ef237bfb156d74 SHA-1: e3c67ec2e4baf83d0e610687a24fe0fb6b646ff0 SHA-256: 3773556d53c8693dd36a16092e7005b1692343eaef23b0b828a85bba626a427a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to manipulate search engine results or redirect users to malicious sites. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML classifier score further indicate malicious intent. The document body, though heavily obfuscated, contains a URL that mimics a search query, reinforcing the phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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/strik?utm_term=how+much+cost+microsoft+office+for+mac PDF link annotation
    • http://mitedujonajezed.scienceontheweb.net/pisob.pdfIn PDF document text
    • https://cdn.sqhk.co/gasosivifug/ieejcDb/runt_kitten_health_issues.pdfIn PDF document text
    • https://cdn.sqhk.co/mewixamok/NP5ZhcM/skyscraper_cast_imdb.pdfIn PDF document text
    • https://cdn.sqhk.co/zisenusaf/cNjejh5/matte_black_glass_christmas_ornaments.pdfIn PDF document text
    • https://cdn.sqhk.co/noviraxat/egjrgcb/xufejumamojunupenosux.pdfIn PDF document text
    • http://bagawixaj.mywebcommunity.org/college_assessment_coordinator_job_description.pdfIn PDF document text
    • http://gexomafe.mypressonline.com/blind_moca_score_interpretation.pdfIn PDF document text
    • http://gakagebir.mypressonline.com/lumovakidewube.pdfIn PDF document text
    • http://tonalemeketav.66ghz.com/dbt_therapy_techniques_for_anxiety.pdfIn PDF document text
    • https://cdn.sqhk.co/vozeseseber/hyKie4C/xasonarebasavaturiforen.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4eb83289-b313-4542-b68c-79a1d4783db4.filesusr.com/ugd/f6336d_c9384affaa9c4bb287c79c028bb0e761.pdf?index=trueIn PDF document text
    • https://7915398d-c9c2-4241-abdb-40cf742e4b8d.filesusr.com/ugd/d4df0f_11a0e60812e847b8ba4a1699aa071c58.pdf?index=trueIn PDF document text
    • http://simipibenafar.epizy.com/accident_reporting_centre_mississauga_ontario.pdfIn PDF document text
    • http://sagovonopa.rf.gd/34803960240.pdfIn PDF document text
    • http://fufibilola.epizy.com/application_format_for_employment_office.pdfIn PDF document text
    • http://matunojusorim.epizy.com/21061610856.pdfIn PDF document text
    • http://zejibanunepi.myartsonline.com/how_to_level_lockpicking_rogue.pdfIn PDF document text
    • https://4253c66a-660d-4c83-b31d-f715833d547b.filesusr.com/ugd/d9e9a0_8e5070a79f814d40a2d3e0f1d57f0117.pdf?index=trueIn PDF document text
    • http://nifupexev.rf.gd/22138234361.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_off0000e1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D7 5144 bytes
SHA-256: 61f9aaed96e041d2dada3af1cac0ad8ecc2424b72bb40f3f7532a23be785fd20
font_01_sfnt_off0000f33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33C 10764 bytes
SHA-256: cf68ada7b0023a762de4c426add6efb0f3fa1b35144764205f2cc7283024abc2

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