Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbd986f62d1da4b3…

MALICIOUS

PDF

68.6 KB Created: 2021-03-17 22:06:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: c3f09e7b406a426f95078489e2c1f64f SHA-1: 879f46ed33385ac66111bf243cb20ee64842f73d SHA-256: dbd986f62d1da4b38216db58424a85eaddc9339129b5fbc371765197778899a2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, likely for further exploitation.

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://bologen.ru/wix?keyword=manual+twisted+potato+slicer PDF link annotation
    • http://fuvidevifa.scienceontheweb.net/chattanooga_hydrocollator_manual.pdfIn PDF document text
    • http://itanah.space/68473287199wnt5p.pdfIn PDF document text
    • https://jurefuzosapob.weebly.com/uploads/1/3/4/9/134901670/125412.pdfIn PDF document text
    • http://jabilevij.mypressonline.com/how_to_turn_off_alarm_on_an_armitron_watch.pdfIn PDF document text
    • https://gesogakit.weebly.com/uploads/1/3/4/5/134581759/gilifezotivosito.pdfIn PDF document text
    • http://lizowaw.scienceontheweb.net/67535681219.pdfIn PDF document text
    • http://jefuxifutubanal.iblogger.org/accidentes_laborales_libro.pdfIn PDF document text
    • http://xesepoxobij.22web.org/44426686734.pdfIn PDF document text
    • http://luxibolozumuj.iblogger.org/75849395775.pdfIn PDF document text
    • https://nilijinaxobizag.weebly.com/uploads/1/3/4/3/134356504/momezufiwopiwev.pdfIn PDF document text
    • http://makedctl.site/depavolisisogezedurekivil6t3j.pdfIn PDF document text
    • http://kitigaw.22web.org/74964111622.pdfIn PDF document text
    • http://neletaparufo.scienceontheweb.net/88209024908.pdfIn PDF document text
    • http://biomaniks.website/toyota_camry_2018_price_in_pakistan_olxg76p2.pdfIn PDF document text
    • http://jiteruruw.sportsontheweb.net/big_green_egg_cookbook.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zarenubopopo.epizy.com/fundsmith_sustainable_equity_fund_fact_sheet.pdfIn PDF document text
    • http://xuwugufufokiti.epizy.com/ethical_dilemmas_in_social_work.pdfIn PDF document text
    • http://jimakobogugiwa.epizy.com/tinker_island_mod_apk_1._4._32.pdfIn PDF document text
    • http://kanusilos.epizy.com/biblia_de_estudio_thompson_para_leer.pdfIn PDF document text
    • http://bivoxubi.epizy.com/66689029519.pdfIn PDF document text
    • http://tozuduxaxikagik.rf.gd/mvc_tutorial_microsoft.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_off0000d031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD031 5164 bytes
SHA-256: b65777beca0a64c1c3ecbd63261e8037bc359da429b2dc867503a18082c082a5
font_01_sfnt_off0000e1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E9 10264 bytes
SHA-256: 08bff4f50d812aeafc1c65116262e0ffebc7f401062c9292cd77ec0879876bbe

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