Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c82b19b3665f31…

MALICIOUS

PDF

90.7 KB Created: 2021-04-21 22:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ace1673fad3bb41596ab6877f17183b5 SHA-1: fa882f045e3d309cc9264b0d7c70d2b569e49199 SHA-256: a8c82b19b3665f31db33c1719b86f7a16704af49390a2e3e7928479f28e02905
126 Risk Score

Malware Insights

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

The file was detected as malicious by multiple engines, including ClamAV and an ML classifier. It contains numerous embedded URLs, with one prominent external URI pointing to 'https://lozipotod.ru/strik'. The PDF structure also indicates it's a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the presence of external links and the nature of the detection point towards an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://lozipotod.ru/strik?utm_term=present+continuous+exercises+pdf+british+council PDF link annotation
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/e7a55da8cf6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417658/normal_606a70028b0ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405419/normal_60410605ec29e.pdfIn PDF document text
    • https://bezatawe.weebly.com/uploads/1/3/0/9/130968967/jefenarumaratixosib.pdfIn PDF document text
    • https://zapizurur.weebly.com/uploads/1/3/4/9/134900478/fupal.pdfIn PDF document text
    • http://donutota.iblogger.org/fundamental_organic_chemistry_book.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463812/normal_5fcc046b694e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392877/normal_5fda1f93ba289.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426822/normal_6013e367dc38c.pdfIn PDF document text
    • https://pulezigo.weebly.com/uploads/1/3/4/6/134600697/jizujotikonasi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461770/normal_606069efdfa6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470535/normal_603f547c077e0.pdfIn PDF document text
    • https://rulafowobunafo.weebly.com/uploads/1/3/5/3/135391395/zazabejas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rosiwik.epizy.com/lasibap.pdfIn PDF document text
    • http://jabepujun.epizy.com/geometry_congruent_triangles_answer_key.pdfIn PDF document text
    • http://labiwuju.rf.gd/antidoto_definicion.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/corporate_finance_asia_global_edition_answer.pdfIn PDF document text
    • http://wevovodoneto.epizy.com/string_format_javascript_jquery.pdfIn PDF document text
    • http://luselobek.epizy.com/paladin_leveling_guide_p99.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/transformers_studio_series_bumblebee.pdfIn PDF document text
    • http://kapetevik.epizy.com/annotated_bibliography_references_format.pdfIn PDF document text
    • http://validexa.epizy.com/occupation_list_australia_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/lujigi.pdfIn PDF document text
    • https://s3.amazonaws.com/ditiruz/let_it_go_piano_sheet_easy.pdfIn PDF document text
    • http://xolelapideruse.epizy.com/pavoxeseturesesov.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B26 5244 bytes
SHA-256: c24aa465d62b1a5313ba3e56a16383d9827e52f4d12f6adb52ce070f8b6491f3
font_01_sfnt_off00011cf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF8 11980 bytes
SHA-256: 8e29166a58bbc26dca7bd1590743672a5eaafb5c990ea3a17562db05191ba9c6
font_02_sfnt_off0001455b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1455B 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e