Malicious PDF — malware analysis report

Static analysis result for SHA-256 c019768ce568ea48…

MALICIOUS

PDF

75.5 KB Created: 2021-06-04 21:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 73d4d56c0a57055ffd5df355d481a79c SHA-1: ea06828eb111693d453705b024b141d9068c256d SHA-256: c019768ce568ea480d2f5c05d512126e9803deeb1052d0375cb21c5fe5241adc
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous external URIs, with a primary malicious URL being https://allytemp.ru/pbw?utm_term=gina+wilson+all+things+algebra+2014+unit+5+test. The document body, though heavily obfuscated, suggests an attempt to lure users with educational-sounding content. No scripts were extracted, but the presence of multiple links and the overall detection suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://allytemp.ru/pbw?utm_term=gina+wilson+all+things+algebra+2014+unit+5+test PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4500897/normal_60b57d2a5ae3d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448339/normal_5fdfdaff7e87b.pdfIn PDF document text
    • https://mumetepelexax.weebly.com/uploads/1/3/4/4/134461787/d35d945f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443624/normal_604f9ed97adea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486200/normal_602dd08d9ff4e.pdfIn PDF document text
    • https://fotavisemaro.weebly.com/uploads/1/3/1/4/131406710/reregexup_xosatusuw_nozupebovoneku_risifur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481847/normal_602afe2d26375.pdfIn PDF document text
    • https://zuzuvisaze.weebly.com/uploads/1/3/0/7/130738998/pisemizesa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://guronavageba.pbworks.com/f/apocalypse_dragon_breed_dragon_city.pdfIn PDF document text
    • http://zikasamu.pbworks.com/w/file/fetch/144448944/different_types_of_depreciation_methods_ppt.pdfIn PDF document text
    • http://pezaloribed.pbworks.com/f/93777373645.pdfIn PDF document text
    • http://pusavivo.pbworks.com/w/file/fetch/144456684/limparfait_exercices_cm1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e0e7f3b-4cbe-4895-bd41-1ca24e4675d4/restful_web_services_simple_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6370c39d-189d-49b5-912f-a428a4edb258/99653559470.pdfIn PDF document text
    • http://negaboxa.pbworks.com/w/file/fetch/144601224/twist_of_the_wrist_2_download.pdfIn PDF document text
    • http://molosafokaji.pbworks.com/w/file/fetch/144621348/holt_mcdougal_united_states_history_homeschool_package.pdfIn PDF document text
    • http://tujelupirobe.pbworks.com/f/jotuvibamop.pdfIn PDF document text
    • http://noxiwako.pbworks.com/f/free_printable_fish_coloring_pages_for_preschoolers.pdfIn PDF document text
    • http://nafidob.pbworks.com/f/xefilizul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26ce7d1e-afe1-453e-8371-63f113981ce9/tivexixidi.pdfIn PDF document text
    • http://fufitiruw.pbworks.com/f/13607318715.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_off0000e62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62E 5748 bytes
SHA-256: 4a8c993e1b97bd0a8f9c00c6909e5e566f9cbc8808231c19509f3763c8229942
font_01_sfnt_off0000f9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DD 10968 bytes
SHA-256: e748740ab28f174333673c6988d58c91dcf1ec3d4ee45ea28b2a6195a8e4b171