Malicious PDF — malware analysis report

Static analysis result for SHA-256 9253c680b9784d51…

MALICIOUS

PDF

74.6 KB Created: 2021-03-20 11:24:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb3adca81be9daeb263f2963533a01f1 SHA-1: 3791ff38ffae9f0eaa6e450a41ef75f772a28d78 SHA-256: 9253c680b9784d51cdaf49a935bbc25fe9b483f831ad37d88a938177904303bd
66 Risk Score

Malware Insights

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

The sample is a PDF file that contains numerous embedded URLs pointing to disposable domains, indicative of a link farm or phishing lure. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of external URIs and the PDF structure suggest an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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/wix?keyword=drill+to+win+pdf
    • http://jolidulikan.scienceontheweb.net/66335471351.pdf
    • http://bererudi.22web.org/okasha_philosophy_of_science.pdf
    • https://cdn-cms.f-static.net/uploads/4374199/normal_6023f4d0dea19.pdf
    • http://pakirekugep.scienceontheweb.net/ignou_b._ed_application_form_2020.pdf
    • http://tesodip.iblogger.org/regadodusodav.pdf
    • https://cdn.sqhk.co/matikefateri/lhbJjc5/boxakowaxogoxevelib.pdf
    • https://static.s123-cdn-static.com/uploads/4384145/normal_5fe32dc3c037f.pdf
    • https://cdn.sqhk.co/xosaletozobi/nPHhhgi/bobrick_ada_restroom_guide.pdf
    • http://movawizaxaxato.mywebcommunity.org/elias_canetti_auto_da_fe.pdf
    • http://gavolav.mywebcommunity.org/63021587736.pdf
    • http://pimunipimikuvaj.iblogger.org/abhishekam_movie_ringtones_free.pdf
    • http://duwinijuj.mypressonline.com/zasetuwetazowibes.pdf
    • https://cdn.sqhk.co/zebimapajod/gejgxwE/poluzix.pdf
    • https://static.s123-cdn-static.com/uploads/4407818/normal_5fcd1620bed76.pdf
    • https://cdn-cms.f-static.net/uploads/4366957/normal_60129545886fc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gigitepusiligo.epizy.com/facebook_for_android_apkpure.pdf
    • http://bedegotix.epizy.com/duwasise.pdf
    • http://zipulosi.atwebpages.com/analgesia_anaesthesia_and_pregnancy_a_practical_guide.pdf
    • http://moseligukunevuz.epizy.com/the_stand_1994_miniseries.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eae4.bin
6ce02d215b447c58baa2ddb8be3f638d470cd0a601c013b30f9bf3711849b3e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE4 4740 bytes
font_01_sfnt_off0000fb26.bin
4c4a70fa9474076121595bf8757a2a544cb8d85ed62d797c9948f6f0ebf81624		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB26 10092 bytes

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