Malicious PDF — malware analysis report

Static analysis result for SHA-256 d531fa6e37129255…

MALICIOUS

PDF

93.4 KB Created: 2021-03-15 05:19:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0400b87828c37ce546274e9762850070 SHA-1: 26c1b38520dba056ed69a8ab13e9b868b7176616 SHA-256: d531fa6e37129255d3c6f6d0f3dab2cddb10b766674a800844876375b2bbf838
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious sites, potentially leveraging embedded JavaScript for obfuscation or further redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://golowaki.ru/award?keyword=adhkar+after+obligatory+prayers+pdf PDF link annotation
    • http://jiteruruw.sportsontheweb.net/conair_clipper_blades.pdfIn PDF document text
    • https://bogevojozoluki.weebly.com/uploads/1/3/4/7/134708627/895969.pdfIn PDF document text
    • http://punejew.mygamesonline.org/social_security_income_tax_for_2020.pdfIn PDF document text
    • http://pasikufopubiwo.mypressonline.com/diferencia_entre_aterosclerosis_y_arteriosclerosis.pdfIn PDF document text
    • http://gitikirazidapi.medianewsonline.com/canon_eos_rebel_t3i_600d_manual.pdfIn PDF document text
    • http://mukinokelek.mygamesonline.org/knee_exercises_for_seniors.pdfIn PDF document text
    • https://gegovowazuravas.weebly.com/uploads/1/3/1/3/131398401/f62c8a9f.pdfIn PDF document text
    • http://dewisazovuvoxi.mywebcommunity.org/aula_internacional_1_libro_del_alumno_gratis.pdfIn PDF document text
    • http://zodimasar.mypressonline.com/arms_reach_co-sleeper_versatile_bassinet_-_misty.pdfIn PDF document text
    • https://wiwanozamo.weebly.com/uploads/1/3/4/3/134306351/fcf7eacbd87af.pdfIn PDF document text
    • https://bofopigefofimun.weebly.com/uploads/1/3/4/0/134016695/a3339809.pdfIn PDF document text
    • https://nogudoge.weebly.com/uploads/1/3/4/0/134017621/wibizenem-mowasobeduvapot-wexedodag.pdfIn PDF document text
    • http://nulivanofika.mygamesonline.org/gogejepi.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
    • https://uploads.strikinglycdn.com/files/b2ae4eef-cb35-499d-9fa5-6e4fe0090bc3/fikujizitaxigav.pdfIn PDF document text
    • http://najekaweza.onlinewebshop.net/meat_buyer_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/bss_full_form_in_telecom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5411fa62-e2d2-47f5-a3ae-fd4f4dbfea45/cuento_breve_sobre_la_independencia_de_mexico.pdfIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/27760704893.pdfIn PDF document text
    • https://s3.amazonaws.com/wizomoravazub/lijis.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00012f95.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12F95 22896 bytes
SHA-256: ea9e972697ce64b7d803eac3b51a0f5bff345f721ece4c5e9fda16d89f468f63
font_00_sfnt_off0000f6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AF 5280 bytes
SHA-256: a8dc1e957e86f7fa50c7ea52996c64b4e7ffa320de8ffefe670ab8db90329485
font_01_sfnt_off000108b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B8 11344 bytes
SHA-256: fc3a6936b09605ba405dc4bc1350ad14d077c3bdc5f1d7a1a54bfebc4370f9a8
font_03_sfnt_off00015835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15835 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2