Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7d3271d1a52c149…

MALICIOUS

PDF

75.6 KB Created: 2021-03-24 16:07:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1ae15c906230430337452143506f1397 SHA-1: e2d4dba4bc002d05482cb5c92f5d8ebb68bb82ea SHA-256: e7d3271d1a52c1491b7bdea50f060f8f3ef2ec6df94ca77c6cee9d0a082a2c06
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a common tactic for link farms used to distribute phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the PDF and its numerous external URLs suggest it is designed to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://crophysi.ru/aws?utm_term=r+basics+tutorial+pdf+statistics PDF link annotation
    • https://cdn.sqhk.co/sobexofap/ihif4hh/pixebibivowobowaxud.pdfIn PDF document text
    • http://7evenrp.ru/how_to_unlock_disabled_iphone_5_without_computer_or_itunes946dt.pdfIn PDF document text
    • https://cdn.sqhk.co/jebumujo/cijhgpm/badland_mod_apk_revdl.pdfIn PDF document text
    • https://cdn.sqhk.co/kewebogi/8VBFjhc/rush_limbaugh_podcast_youtube_may_23_2019.pdfIn PDF document text
    • http://memujinirenupa.iblogger.org/14834179734.pdfIn PDF document text
    • https://cdn.sqhk.co/nutewakizi/8hfrhbC/entrepreneurial_mindset_book.pdfIn PDF document text
    • https://xadadoroz.weebly.com/uploads/1/3/6/0/136024884/2470241.pdfIn PDF document text
    • http://robertferrell.net/irs_reporting_sale_of_partnership_interestrx75c.pdfIn PDF document text
    • http://vefuxeromuriwir.iblogger.org/asia_map_with_countries_and_capitals.pdfIn PDF document text
    • https://nikatomorufaxeg.weebly.com/uploads/1/3/1/4/131437252/nitesikibal.pdfIn PDF document text
    • https://bijivabaj.weebly.com/uploads/1/3/4/6/134601785/dotufunefem-koker-fajitogiwo.pdfIn PDF document text
    • https://cdn.sqhk.co/liwifetil/Y0oDhfj/wings_financial_locations_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/badexejos/uheXgik/digicel_top_up_app_apk_download.pdfIn PDF document text
    • https://junobinedutuki.weebly.com/uploads/1/3/2/7/132712306/f8f6c2ee9.pdfIn PDF document text
    • http://findssldz.xyz/worarugorofenigotz7523.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5de9ed01-d610-4143-94db-6f998645a8ce.filesusr.com/ugd/1d8bf6_344545d6fcf34d61840401de9f0e00e3.pdf?index=trueIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_9756c37c8c3d44f9a993cd24563ce181.pdf?index=trueIn PDF document text
    • http://juzavinozil.epizy.com/matric_certificate_template.pdfIn PDF document text
    • http://jexiduro.rf.gd/cinquenta_tons_de_cinza_livro_gratis.pdfIn PDF document text
    • https://e0ff2378-281a-4ea3-95ae-419c526fdc99.filesusr.com/ugd/0baf77_375c16d69af84156b56d4e9bfd415e0d.pdf?index=trueIn PDF document text
    • https://be08d7d4-326a-4801-be9d-4496af17a43b.filesusr.com/ugd/d31907_8db5a645c0e84bab9532e361f16541fd.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_off0000e775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE775 5296 bytes
SHA-256: cc4546adf3d05cc7e12b0237edb1a24a5aa79e28548f1426245209311de9ba35
font_01_sfnt_off0000f986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF986 11156 bytes
SHA-256: c02f4b5367f61e556b12609b0269f33d76225887cf0a84bd11a8929375523095