Malicious PDF — malware analysis report

Static analysis result for SHA-256 51762163dca71fef…

MALICIOUS

PDF

88.9 KB Created: 2021-03-14 01:46:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 044d37765035e39a912bbfa088352259 SHA-1: 0c16de5b844478d0268487987efdcad1f869a377 SHA-256: 51762163dca71fefcf4348eeb028aa553230792408fd3aae9177639532a0bed6
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed to redirect users, and the presence of external URIs suggests an attempt to lead the user to a malicious site. The document body, though heavily corrupted, contains keywords related to car models, likely used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://pelibifir.ru/wb?keyword=lexus%20rx%20350%20dimensions%202021 PDF link annotation
    • http://alifan.store/8682652001gnrh8.pdfIn PDF document text
    • http://tevituvodejifep.mywebcommunity.org/arabic_calendar_1439_with_english.pdfIn PDF document text
    • http://namafafiteg.mypressonline.com/36032123919.pdfIn PDF document text
    • http://mebelrostov.ru/68576546534qu0re.pdfIn PDF document text
    • http://mikrotikwizard.com/99780653300elks0.pdfIn PDF document text
    • http://bomepufibawil.scienceontheweb.net/baudrillard_simulacra_and_simulation_book.pdfIn PDF document text
    • http://ig-about.net/50268674505zot4m.pdfIn PDF document text
    • http://mebel-albero.ru/fluturi_de_irina_binder_downloadvoz7v.pdfIn PDF document text
    • http://riwalimuj.scienceontheweb.net/baroque_guitar_tablature.pdfIn PDF document text
    • http://straponartist.com/zubedapi4ep.pdfIn PDF document text
    • http://fozivot.mypressonline.com/zamuvixupojesaxufes.pdfIn PDF document text
    • http://belkwigs.com/weber_spirit_classic_e_210_gas_barbecue_coverdt45u.pdfIn PDF document text
    • http://dawexefif.getenjoyment.net/93414351804.pdfIn PDF document text
    • http://rewita.fun/welarusiludumasifikhiln6.pdfIn PDF document text
    • http://siteznakomstv69.space/93705973674enyhh.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://dutakewapil.epizy.com/vipugujiwipejevuwaguj.pdfIn PDF document text
    • http://tijuvewoduga.onlinewebshop.net/todimi.pdfIn PDF document text
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_2ef544553f9e40b29a9798de70823819.pdf?index=trueIn PDF document text
    • http://xipanizi.myartsonline.com/how_to_watch_the_maze_runner.pdfIn PDF document text
    • http://tanasebebibe.epizy.com/23810039176.pdfIn PDF document text
    • https://44034db3-6cdd-4729-adf3-7ccd6afcf354.filesusr.com/ugd/9fe9cc_15dbb83e37d4482896afe6897d0aad3a.pdf?index=trueIn PDF document text
    • https://217ba8a6-026c-4a9e-b1ce-2eadff0a4a08.filesusr.com/ugd/3d7af5_744463f27f654e4ca0c493aaaf530b66.pdf?index=trueIn PDF document text
    • https://34ea5197-a9e9-4ba5-99bb-a7dd7aeba98b.filesusr.com/ugd/234f58_d577cb283b984665a57846fc594ca194.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB85 5156 bytes
SHA-256: 8766a42316097c73f77ab5e9d9e41264fee3e3e408241d9add58b3fba3f9ae44
font_01_sfnt_off00010cf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF5 10956 bytes
SHA-256: db4698cf71ca6ce4f76f453a024addcee25db8d521624aa4b4d5f13cce42ba15
font_02_sfnt_off00013274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13274 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15
font_03_sfnt_off000147a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147A2 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333