Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5b060500be27ea1…

MALICIOUS

PDF

71.7 KB Created: 2021-02-15 23:00:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1f4505dc8bd84ffad18e3799db6b9108 SHA-1: b168c18ff654758db3a7835d85ea4f16602e4fbd SHA-256: c5b060500be27ea1a9103de8cd2ac2652e141b793524d8f2b8035bedb02b0f09
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with one prominent URL pointing to a link farm on disposable hosting. The document body, though heavily obfuscated, appears to be a lure related to 'egg cooker instructions'. The ML classifier strongly indicates maliciousness, and the presence of many external URIs suggests an attempt to redirect the user to a malicious site for further exploitation.

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://jottigo.ru/123?utm_term=dash+rapid+egg+cooker+instructions+hard+boiled+eggs PDF link annotation
    • http://zedanipon.iblogger.org/msdn_microsoft_sql_server_2016.pdfIn PDF document text
    • https://mukuriwubi.weebly.com/uploads/1/3/1/4/131483253/4002604.pdfIn PDF document text
    • https://roguraluvi.weebly.com/uploads/1/3/0/7/130776180/kajilepe_felirudezefef_dakok.pdfIn PDF document text
    • http://gajikabe.iblogger.org/kingsman_2_the_golden_circle_parents_guide.pdfIn PDF document text
    • http://fimozagori.iblogger.org/tidujaxe.pdfIn PDF document text
    • http://mekozeka.66ghz.com/xikewe.pdfIn PDF document text
    • https://wurivebufe.weebly.com/uploads/1/3/0/8/130874680/dekiravanar.pdfIn PDF document text
    • https://ditoleruv.weebly.com/uploads/1/3/5/3/135345680/9dcecdb706.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://goguvero.epizy.com/wotuxezivogivolezomo.pdfIn PDF document text
    • http://fijoramobizedej.epizy.com/tinewekig.pdfIn PDF document text
    • http://viruvivena.epizy.com/abceso_perianal.pdfIn PDF document text
    • http://gididesipevex.rf.gd/free_checkers_game_for_mac.pdfIn PDF document text
    • http://veguxakafopuvix.epizy.com/manuel_d_alphabtisation.pdfIn PDF document text
    • http://xasaduditomup.epizy.com/2013_acc_statin_guidelines.pdfIn PDF document text
    • http://dojagosixotebut.rf.gd/38694611114.pdfIn PDF document text
    • http://gekazez.epizy.com/bovonatoribakez.pdfIn PDF document text
    • http://dimogotewebi.epizy.com/autocad_2013_full_version_free.pdfIn PDF document text
    • http://bulegenarofil.epizy.com/telitinekipuwutelajemo.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_off0000d99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99A 5536 bytes
SHA-256: 0559743ea053b443f54a0001f277212423c0be4f17400fee9872dc2dc1258cfd
font_01_sfnt_off0000ec68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC68 10712 bytes
SHA-256: 40c95cf7cec060c6cdc2c352f3e251e0f4d641820bbc35c0240c96fc275aeb62

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