Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dfb4052c1feaa16…

MALICIOUS

PDF

80.1 KB Created: 2021-02-26 03:24:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 949000a52632adbf4c58171a5d7186d4 SHA-1: b2192a2c9ee9864fb676c5ed5d3dced389d16097 SHA-256: 2dfb4052c1feaa1696241d187a44c6632e3ad9f24b62c7017e6ccf54fdfa39bf
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of external URIs and the overall structure suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/strik?utm_term=ccna+guide+to+cisco+networking+fundamentals+pdf PDF link annotation
    • http://shopee24.site/tozuzanegosepurusuvere51mhb.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/mountain_america_credit_union_promo_code.pdfIn PDF document text
    • https://cdn.sqhk.co/dowamagova/jdgf2hj/wubugakazawaxevadewix.pdfIn PDF document text
    • http://komaxinatobofe.medianewsonline.com/raxalunu.pdfIn PDF document text
    • http://xsale.trade/rarufaxixtkpca.pdfIn PDF document text
    • http://kakafeg.scienceontheweb.net/vapup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412164/normal_603422e582cdf.pdfIn PDF document text
    • http://luxasireku.sportsontheweb.net/vanoditobitutuza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444864/normal_5ff072199e9ae.pdfIn PDF document text
    • http://siwivelijutore.medianewsonline.com/nikalalefidenetudomexuji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476952/normal_60381f2d06ceb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xakagigoneliv.myartsonline.com/pumabipaduvipezikapituv.pdfIn PDF document text
    • http://vidugozu.atwebpages.com/student_engagement_in_the_classroom_examples.pdfIn PDF document text
    • http://liwukoxobumex.rf.gd/13425234599.pdfIn PDF document text
    • http://zobadobu.epizy.com/maxutixeje.pdfIn PDF document text
    • http://vinarudafolu.epizy.com/vozajoxesilubiloropijofej.pdfIn PDF document text
    • http://kavibajegis.onlinewebshop.net/el_nombre_de_la_rosa_castellano.pdfIn PDF document text
    • http://pojozija.onlinewebshop.net/why_is_my_computer_not_charging_while_plugged_in.pdfIn PDF document text
    • http://bogalibamadom.myartsonline.com/gisegifivol.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_off0000fd65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD65 5536 bytes
SHA-256: 553e42593eece63253e86bffb1f4c2be2605d9fe61acc065d72791dda7eea5b2
font_01_sfnt_off0001103b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103B 10032 bytes
SHA-256: 9b3db4be3ac4616fe2d360ee79ad998b3106f6005f39d035bb3cbae5187011c4

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