Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e16ab61b4c1f1e0…

MALICIOUS

PDF

73.7 KB Created: 2021-03-14 02:54:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 18183d339d96da5b9d29d3368d23dd3d SHA-1: 28d222b20a6ff23eb45f051aa45c3262751f3d6f SHA-256: 3e16ab61b4c1f1e0b6d0d43548e37d701c8d258548c043b5c10576b74099879c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, with many pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful sites. The document body, though heavily obfuscated, contains metadata related to PDF creation and a query about animated GIFs, which may be a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://leonvi.ru/award?keyword=can+i+put+an+animated+gif+in+a+pdf PDF link annotation
    • http://itdomen.fun/tamujutuxp3mpa.pdfIn PDF document text
    • https://cdn.sqhk.co/zexukobesu/hj8Viab/41471577965.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426828/normal_5fc96a709b30a.pdfIn PDF document text
    • https://cdn.sqhk.co/dijogiper/hegeifL/rolling_stones_songs_in_open_g.pdfIn PDF document text
    • http://ranking-se.com/78086508128dp3cx.pdfIn PDF document text
    • http://bottlechainworld.com/martin_luther_king_jr_nobel_speech_text8hipr.pdfIn PDF document text
    • https://cdn.sqhk.co/mifigatira/jg9hcje/6006485034.pdfIn PDF document text
    • https://cdn.sqhk.co/dasoxitif/XjigiTf/jumevafusuti.pdfIn PDF document text
    • http://fringigejy.site/jesujajugaselilkwrid.pdfIn PDF document text
    • https://cdn.sqhk.co/dirotiweze/oPfaTig/fejizubelago.pdfIn PDF document text
    • https://cdn.sqhk.co/zovaratigu/ajiHbjb/football_clicker_2015_apk_with_real_player_names.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451945/normal_5fc8199663066.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455658/normal_600eb1905c848.pdfIn PDF document text
    • https://cdn.sqhk.co/wefekoferu/fgfIFF4/translate_a_webpage_into_spanish.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448976/normal_600a059d28a73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410703/normal_601b27cb252d3.pdfIn PDF document text
    • http://mastericy-chistoty.ru/lukubuvoxelxlkl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/164670b7-ae3c-48cf-a65c-02b9ca047b86/ldg_it-100_ic-7300.pdfIn PDF document text
    • http://wepaxilex.epizy.com/gejosemibitufazurikuj.pdfIn PDF document text
    • http://xotaxebotejij.rf.gd/56095260342.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9effd24a-1f9a-4cd9-8206-93320d322bc2/85135056600.pdfIn PDF document text
    • http://totenudiwuwodu.epizy.com/rapedu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/119335cb-9fa9-4a7d-a291-04feab002798/zojerowifomufokamij.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_off0000e373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE373 4960 bytes
SHA-256: 6b5aee2befdb68cdd1c8d9852288eef8e570160030ede84fd58853232c0ac7ed
font_01_sfnt_off0000f44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44B 10884 bytes
SHA-256: 9a1ad67bb70566a9dd5d18077262d716bfb7e61102fb006b420dd6c13b8c83f2

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