Malicious PDF — malware analysis report

Static analysis result for SHA-256 16030ab1ce786ed9…

MALICIOUS

PDF

83.8 KB Created: 2021-02-28 18:52:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: d990408a950dc28107caee6da5b260b9 SHA-1: 293ea5e9dede8f7cea6551d0d56687b1634ba389 SHA-256: 16030ab1ce786ed9f8ffa2dd7967bc776ebaa1c6afb3bf00507827c846571f89
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a malicious intent to redirect users. The ML classifier strongly indicated maliciousness, and the presence of external URIs and a link farm heuristic further supports this. Although no scripts were extracted, the document's structure and numerous links are indicative of a lure for SEO spam or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://bologen.ru/wix?keyword=nostalgia+snow+cone+machine+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4418788/normal_6002edbabcb90.pdfIn PDF document text
    • https://cdn.sqhk.co/fumodolanes/jhgdib9/prison_escape_game_unblocked.pdfIn PDF document text
    • https://xevulesej.weebly.com/uploads/1/3/0/8/130874496/salaxa_digak_rekolusi_rakizo.pdfIn PDF document text
    • https://cdn.sqhk.co/vujejanar/jehbQja/90369123637.pdfIn PDF document text
    • http://nagupenaxija.iblogger.org/zazewovukufixapetaj.pdfIn PDF document text
    • https://wegabikiwapalev.weebly.com/uploads/1/3/5/9/135992979/govuxitip.pdfIn PDF document text
    • http://geparup.scienceontheweb.net/ribuxav.pdfIn PDF document text
    • https://fosobezi.weebly.com/uploads/1/3/4/8/134898374/2f979de04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460243/normal_603b2ffadea49.pdfIn PDF document text
    • https://cdn.sqhk.co/temejikowewa/ic4jjhh/66068380769.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491671/normal_600415f243a2b.pdfIn PDF document text
    • https://sarejazaxixosib.weebly.com/uploads/1/3/4/6/134633098/jitanel_loleda_mupum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tebaputazaxuva.myartsonline.com/3201067503.pdfIn PDF document text
    • http://bepenaguvofiw.epizy.com/27573047775.pdfIn PDF document text
    • http://renulekefa.epizy.com/7071775122.pdfIn PDF document text
    • http://xuvekixofeku.onlinewebshop.net/what_is_addie_process.pdfIn PDF document text
    • http://titugol.atwebpages.com/bojiratozogerajivagikalir.pdfIn PDF document text
    • http://lakekawe.rf.gd/aptamil_pepti_2_feeding_guide.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_off0000f5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D9 5180 bytes
SHA-256: 92fe7e4f768b5facc7c83d2148d5c36ac84e8f3d71d500e82ed0a22995895d01
font_01_sfnt_off0001076c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076C 10928 bytes
SHA-256: 4a5a875c6c49baa543c634e9c09d5a5cfe2b4fd441e797a3ae69a6763c24e177
font_02_sfnt_off00012d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D07 16072 bytes
SHA-256: 4ce97752c8d1ed0b0302a1507788019c6b738cc3ee96ca273f61f92c287db7cd

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