Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c33a3635864520b…

MALICIOUS

PDF

74.2 KB Created: 2021-03-28 16:29:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 8e0d2976bdae57565794ee38b3855a6d SHA-1: 7b98bc59ceb1adf48ef6d45b34b0418186da273f SHA-256: 5c33a3635864520bdd37f763c288b6df532cce9803f8c6822e66451883100e6c
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous embedded URLs, with one specifically pointing to a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be a lure related to educational worksheets.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/award?keyword=equivalent+algebraic+expressions+worksheet+pdf PDF link annotation
    • https://cdn.sqhk.co/fetumamuv/gfiaOgg/jenebagafi.pdfIn PDF document text
    • https://cdn.sqhk.co/vixonafom/WCShek4/commodity_prices_agriculture.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwefuxab/eljfij3/pocket_ants_colony_simulator_wiki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vufobaratoja.epizy.com/19020661600.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4799b708-0aae-4b36-b18d-0233be37a909/what_is_the_horse_called_in_neverending_story.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/farimulozejuvabixe.pdfIn PDF document text
    • http://vawigopowapab.rf.gd/latimebin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8772b82-d3f2-4240-8dbf-80f232cbc4bb/barrons_sat_subject_test_chemistry_with_online_tests.pdfIn PDF document text
    • http://jedenibiripo.epizy.com/how_to_air_fry_chicken_in_a_convection_oven.pdfIn PDF document text
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_98140a3a34aa4d7e8d2aacbaca3a3ad5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e181d35c-862e-474a-8e01-79220eb36f0e/how_to_update_microsoft_access_2016.pdfIn PDF document text
    • http://kefowuwapurop.epizy.com/99659241178.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/what_are_the_hr_policies_of_tcs.pdfIn PDF document text
    • http://votofeki.epizy.com/hestra_falt_guide_gloves.pdfIn PDF document text
    • http://pojudezafal.rf.gd/problem_on_age_quantitative_aptitude.pdfIn PDF document text
    • http://moduvodaw.epizy.com/anti_ragging_affidavit_by_student.pdfIn PDF document text
    • https://f05e0dbb-21cf-40ea-8b71-00b8d6f49a3b.filesusr.com/ugd/b09e1d_76548be602354b26ac7bd1eb29ce167a.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_off0000e186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE186 5924 bytes
SHA-256: 17d4715c51c0df4ac3ce12fb34d4e245f3c50018839f57df3ea0c5dbd5694590
font_01_sfnt_off0000f5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C2 11132 bytes
SHA-256: 3cb781162cb098a82bd2df157d758e14379a8ce96195d30fe20b97f311615d8d

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