Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd9804e6701361d1…

MALICIOUS

PDF

82.8 KB Created: 2021-04-26 04:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: de90b75f23d313d961791b7c5b067248 SHA-1: 293a159c4473fca1500ced49f3eb965ddb567976 SHA-256: bd9804e6701361d1e365bf98a7417f7c78eeb6dd808ebf7987d6397c5f53a243
214 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to known malicious redirectors or link farms, suggesting a phishing or scam campaign. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing attempt designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=mta+database+administration+fundamentals+exam+questions In PDF document text
    • https://static.s123-cdn-static.com/uploads/4473619/normal_5ff5fe6ce1522.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485163/normal_602062d882473.pdfIn PDF document text
    • http://kemikavar.mypressonline.com/jean_bergeret.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403141/normal_606a01e6b9b3c.pdfIn PDF document text
    • https://wibixebaroz.weebly.com/uploads/1/3/1/8/131856543/9122cb5.pdfIn PDF document text
    • https://vakejijumusefuv.weebly.com/uploads/1/3/5/3/135313512/9902540.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495385/normal_5fcb6b476cefe.pdfIn PDF document text
    • https://rixowumunek.weebly.com/uploads/1/3/5/3/135330445/mejorunupelapuwulofi.pdfIn PDF document text
    • http://gikepofazanapol.mypressonline.com/understanding_and_using_english_grammar_second_edition_answer_key.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444098/normal_60055756c9d1a.pdfIn PDF document text
    • http://gililofus.medianewsonline.com/10141383985.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383470/normal_5fd61e40714f0.pdfIn PDF document text
    • http://devubowoku.mypressonline.com/83847680663.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xidalagep.myartsonline.com/12489012504.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/how_to_set_power_pressure_cooker_xl.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/convert_text_file_to_binary_format_online.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/negative_binomial_distribution_calculator.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/22677245954.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/guwumitikodanonexiwuzutev.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/what_are_the_major_topics_in_biology.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/abysmal_delves_afk_arena_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/briggs_and_stratton_625_series_190cc_oil_filter.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/pc1832_reset_installer_code.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_off000104be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BE 5392 bytes
SHA-256: 85a2e23c313c3c2c92a94baf4e7fae66d612f2d5e365c3cda26996adea644811
font_01_sfnt_off0001170b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170B 11084 bytes
SHA-256: 715e4b0eae6cdd0addcc5564e162729ec67798a4294b7a63b0e22daedb75c239

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