Malicious PDF — malware analysis report

Static analysis result for SHA-256 e24d707f72059c5c…

MALICIOUS

PDF

82.2 KB Created: 2021-04-24 18:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77ee26443d5b3ff52d85ad9d34cbc9f2 SHA-1: 126d9882cda21055dca357e302e99349a13673ca SHA-256: e24d707f72059c5c789d62a57b33972d1d3ebe61a67368252836ccc3f59bfbfd
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. The presence of numerous external URIs, many of which are on disposable hosting and utilize UTM parameters, strongly suggests a phishing or link-farming operation. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://xezojetit.ru/strik?utm_term=samsung+hw+h550+soundbar
    • http://cadenalia.com/mallampalli_weather_reportmw8rb.pdf
    • http://interstart.online/28596546214558le.pdf
    • http://vudifabofugejij.medianewsonline.com/free_english_speaking_lessons.pdf
    • http://motarojetox.sportsontheweb.net/brother_ls_1217_extension_table.pdf
    • http://chelamela.org/18830027504wdzlt.pdf
    • https://panemomozig.weebly.com/uploads/1/3/4/5/134503052/2801102.pdf
    • https://xojakonokixamu.weebly.com/uploads/1/3/1/1/131164577/borevagejake-vulagam.pdf
    • http://mekapidi.medianewsonline.com/nonisetaw.pdf
    • https://xuzitimezavut.weebly.com/uploads/1/3/1/8/131856372/zananawav_mufadowem.pdf
    • http://nujijaj.getenjoyment.net/around_the_world_in_80_days_movie_worksheets.pdf
    • http://study-english-04.space/trial_xtreme_4_bike_upgradesf0hio.pdf
    • http://stnold.com/twilight_saga_new_moon_book_reviewudsg1.pdf
    • http://moshon.space/fojawewazaw229ba.pdf
    • https://buroxaserojer.weebly.com/uploads/1/3/1/0/131070485/mowodigi-pimigoz-zanati.pdf
    • http://beach-fruit.fun/participial_phrases_exercises_with_answerswdwiy.pdf
    • http://fidesuwuranotif.getenjoyment.net/51502736485.pdf
    • http://elinekici.online/laralikiwovejurilavikov5nw5.pdf
    • http://proba7.xyz/metugogzg9mi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://ziwivazud.onlinewebshop.net/11023668756.pdf
    • http://xekazaz.myartsonline.com/franchise_agreement_template.pdf
    • http://vizomonuzujo.onlinewebshop.net/origen_del_imperio_carolingio.pdf
    • http://kofaxafogi.myartsonline.com/tutetapijimon.pdf
    • http://xolavozezimodan.onlinewebshop.net/download_this_is_amazing_grace_by_phil_wickham_ft_lecrae.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f29b.bin
3a3e9c8819b7fefad6b2ac8754659640d13e9f8c4345c3158966947f6aa97960		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF29B 5808 bytes
font_01_sfnt_off00010640.bin
42118e6a4903cfa407fec033049cce7f47cf31eaee2cabd92423d38543ed4a0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10640 22244 bytes

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