Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4d19f647b13871b…

MALICIOUS

PDF

74.1 KB Created: 2021-05-01 03:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f9e6101dfa4eae81f86e3c2d26ba557e SHA-1: 118d9f7dde76e7a745ff649678a1da154a93a769 SHA-256: a4d19f647b13871b41fedb48b7e66cc3170969103361dd2582b3f1ae28e032f5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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
  • 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://pelibifir.ru/strik?utm_term=casio+lk-100+review PDF link annotation
    • http://powerpoint4you.ru/bumuresilakafulepukodizw9r3.pdfIn PDF document text
    • http://vemelaribox.getenjoyment.net/articles_of_association_and_memorandum_of_association.pdfIn PDF document text
    • http://disclosures.space/zufaxasanaw87f3m.pdfIn PDF document text
    • https://lopekemin.weebly.com/uploads/1/3/4/6/134628767/vomidurapovewom.pdfIn PDF document text
    • http://zafikapasipugog.medianewsonline.com/abrsm_grade_2_theory_book.pdfIn PDF document text
    • http://particulier-societegenerale.xyz/bams_cch_full_formsmq4t.pdfIn PDF document text
    • https://nematoluzi.weebly.com/uploads/1/3/1/4/131409841/defibebalakojopij.pdfIn PDF document text
    • https://bufekebutejef.weebly.com/uploads/1/3/1/8/131856184/767203.pdfIn PDF document text
    • http://qrastenmap.online/head_first_pmp_4th_edition_free_downloadlyb9s.pdfIn PDF document text
    • http://bewilotaweje.mywebcommunity.org/business_model_file.pdfIn PDF document text
    • http://presentinsta.site/ps4_gold_headset_7.1_on_pcb1onz.pdfIn PDF document text
    • http://lejunuzegakikuv.mypressonline.com/the_dot_by_peter_reynolds_activities.pdfIn PDF document text
    • http://sevezor.scienceontheweb.net/xexosikujixudawi.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/bosiwofume.pdfIn PDF document text
    • http://praktika-ingenieur.com/51270107194qa98j.pdfIn PDF document text
    • http://raguvigawak.mypressonline.com/sherman_alexie_superman_and_me_summary.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kususen.myartsonline.com/zuzevefetipowodajib.pdfIn PDF document text
    • https://dba0ca6b-c979-46b3-87c9-041648dee063.filesusr.com/ugd/6f58fb_d7cfb28656524962b1bb8e3a7cf64c35.pdf?index=trueIn PDF document text
    • https://d86ad34a-7df2-4f47-937b-a12ab5abc0fa.filesusr.com/ugd/8cbfce_27a368b5c35b43a8bd149e3707da4b18.pdf?index=trueIn 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_off0000e53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53C 5024 bytes
SHA-256: 85f1eae823e13e66747f0a130140eeb1262e9f3e128f7e3e44ecaad2ba4eaee1
font_01_sfnt_off0000f67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67C 11184 bytes
SHA-256: cd5a52d697e12c9734f14f37086e193939773baae9c6b96d1c915e460adec6a0