Malicious PDF — malware analysis report

Static analysis result for SHA-256 18cdf69819f0299a…

MALICIOUS

PDF

82.9 KB Created: 2021-04-24 11:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 40a8bedab8a571dde46e5d80e0f80028 SHA-1: 53f321b15915b1e8ac07a28ded7b5efe1dc6abe4 SHA-256: 18cdf69819f0299a486e630fa3cb6fdfb06758b0ec52b8ceefd4acd69cb34e38
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://fokemale.ru/strik?utm_term=what+is+admission+quota PDF link annotation
    • http://domainlimax.xyz/gujirususagowumukuvatabo4ervv.pdfIn PDF document text
    • http://giveaway2020.info/2297712374186kab.pdfIn PDF document text
    • http://kersita.space/293545477261iwf7.pdfIn PDF document text
    • http://phillipen.online/papeluniputeturogevab47uhc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446491/normal_5ffc3718183cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453888/normal_604f116eb1a6e.pdfIn PDF document text
    • http://wiinorama.space/livro_livre_para_voar_fabio_teruel35hdl.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/jjihbTX/badlands_bbq_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413457/normal_601fff90cdc50.pdfIn PDF document text
    • http://50offshop.pro/a_world_of_art_henry_m_sayre_8th_edition_freeecd1n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488558/normal_5fe00484cae75.pdfIn PDF document text
    • https://cdn.sqhk.co/noxisoture/jhjgi4J/under_seat_storage_for_2017_toyota_tundra_crewmax.pdfIn PDF document text
    • http://urolog.xyz/tubotarolofisarh0wn0.pdfIn PDF document text
    • http://slmit.fun/chilasow_full_movie_onlineg3skd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370071/normal_6056f329c4cb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488604/normal_6046ee7e42640.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479212/normal_606b7c6cb3add.pdfIn PDF document text
    • http://idem-peshkom.ru/litozemuihryx.pdfIn PDF document text
    • http://draiwenstore.online/mipunidur2uug.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000faea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEA 4840 bytes
SHA-256: ebaeeb5eaa6a49597ff9bc0067b65f144f845b7d67cb67fc8187c68dfa935517
font_01_sfnt_off00010b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B39 10872 bytes
SHA-256: cca7cf97db48d8f9f425004be9ba48697c52669f104d5337d7d57b50de8b5641
font_02_sfnt_off0001303a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1303A 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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