Malicious PDF — malware analysis report

Static analysis result for SHA-256 51a3eeecdcf1517e…

MALICIOUS

PDF

77.3 KB Created: 2021-03-24 08:13:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 46d63c0eb143da498074c6402d57a20e SHA-1: 50b7590e33eb2d545e1405b068135d50767cf291 SHA-256: 51a3eeecdcf1517efdd70fecf15989de03049ec169a1582d15ae779d92122ff8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm hosted on disposable domains, with a high ML score and ClamAV detection for Pdf.Phishing.Trojan. The embedded URL and a linked PDF on a disposable domain suggest an attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://mezovuduw.ru/strik?utm_term=how+to+make+a+central+idea PDF link annotation
    • http://vorgazme.com/86208589240i5jnn.pdfIn PDF document text
    • http://zobabikox.medianewsonline.com/vepapifutexijeligujepin.pdfIn PDF document text
    • http://italywow.info/frick_screw_compressor_spare_parts7f10u.pdfIn PDF document text
    • http://vimobewawulipiz.mypressonline.com/34544444604.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484093/normal_6050254a5c20e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409417/normal_5fe91e3882476.pdfIn PDF document text
    • http://fekowepiz.mywebcommunity.org/netbeans_java_tutorial_for_beginners.pdfIn PDF document text
    • http://creditreportus.info/11267640052lz2ih.pdfIn PDF document text
    • http://ruvikuvi.mywebcommunity.org/why_does_my_dog_always_put_her_toys_on_me.pdfIn PDF document text
    • http://boldly-grow.com/rhythm_city_18_september_2020_full_episode51yu2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449769/normal_5ffc2bd96073c.pdfIn PDF document text
    • http://dopogabijup.mywebcommunity.org/86759845754.pdfIn PDF document text
    • http://zugugalepew.mypressonline.com/concierto_de_aranjuez_piano.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gitojaxekeveki.onlinewebshop.net/14482905661.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/85875789005.pdfIn PDF document text
    • http://lazuletezofik.onlinewebshop.net/tusiwominizanunag.pdfIn PDF document text
    • http://nerezusilanake.atwebpages.com/2005_dt466_injector_replacement.pdfIn PDF document text
    • http://limuzer.atwebpages.com/blynk_arduino_tutorial.pdfIn PDF document text
    • http://nofolimuri.myartsonline.com/kilewavojobafoledil.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/lg_stereo_headset_hbs_750_pairing.pdfIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/bukewut.pdfIn PDF document text
    • https://s3.amazonaws.com/jawusawar/60759570546.pdfIn PDF document text
    • http://fikelamizogu.myartsonline.com/vilosidapisijosovedafixux.pdfIn PDF document text
    • http://rukosivujuxu.atwebpages.com/lateral_thinking_puzzles_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/literary_terms_questions_and_answers.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_off0000efa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA8 5024 bytes
SHA-256: 81e899b2bfad80b70a2573cdc8a45b54020228091bab899a4f49015ee767041b
font_01_sfnt_off000100b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B1 10980 bytes
SHA-256: e3baf42c0772ebc30959d992eeb2a4469f385c4e98b22f6025a5715f7191d342

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