Malicious PDF — malware analysis report

Static analysis result for SHA-256 442148dba2ef67e0…

MALICIOUS

PDF

76.3 KB Created: 2021-02-15 01:09:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: f82da6c4518084b957815f32c5710eb6 SHA-1: 57179e8c832f8748b51ecacc77fa639946c8610c SHA-256: 442148dba2ef67e0381397ba28a42d4e339bb10f293e83aa46a00a7f87429ca3
126 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. The document body, though heavily obfuscated, contains text related to 'Manual instant pot setting' and application metadata, suggesting a lure to disguise malicious links. The presence of multiple disposable and link farm domains further supports a phishing or malware distribution intent.

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://druttle.ru/wix?keyword=manual+instant+pot+setting PDF link annotation
    • http://nafebefunevido.iblogger.org/afrontando_la_esquizofrenia.pdfIn PDF document text
    • http://kurewegunopef.66ghz.com/zabow.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/mhejjfj/cube_surfer_how_many_levels.pdfIn PDF document text
    • http://zipujesilan.22web.org/berloni_catalogo_cucine.pdfIn PDF document text
    • https://nojefawagalubab.weebly.com/uploads/1/3/4/2/134266261/e8719d09.pdfIn PDF document text
    • http://takimopunize.22web.org/calloc_malloc_full_form.pdfIn PDF document text
    • https://damajarulapo.weebly.com/uploads/1/3/0/7/130738748/6b05ce5b1750.pdfIn PDF document text
    • http://vasezasu.22web.org/feedback_form_for_parents_workshop.pdfIn PDF document text
    • http://palejep.22web.org/32153550465.pdfIn PDF document text
    • https://fuwiposodunumof.weebly.com/uploads/1/3/1/4/131438128/leruxevov_zemexugivogo_wewaxibujojev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tisoparumunezud.epizy.com/81257156252.pdfIn PDF document text
    • http://wumumusonozukak.epizy.com/buvusor.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/47156074234.pdfIn PDF document text
    • http://fanurumuge.epizy.com/newazaditulasamukavuk.pdfIn PDF document text
    • http://kaderuzaxaje.rf.gd/tunulexewinuda.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/best_programmable_coffee_makers_consumer_reports.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_off0000f0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F9 4896 bytes
SHA-256: adc3f3a5a744cd13d0a3f869d22e485fe95954e61b5d5d6fd73d083c4d17b0c5
font_01_sfnt_off000101c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C1 9980 bytes
SHA-256: cb415445e2d6af466e87c3e264c5ff654a1bd889e133d1ced1363850a0fb4758

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