Malicious PDF — malware analysis report

Static analysis result for SHA-256 cafbdb8005e7d6c0…

MALICIOUS

PDF

83.5 KB Created: 2021-03-01 22:39:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 146bd27ab57f57e1e162e457cf037f84 SHA-1: 7a82f02c67028136fca770919653f8fae18c503f SHA-256: cafbdb8005e7d6c0d0542cb437dbb769bf0eee38c9f5dbec45cf49ce9ca37466
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains references to 'zombs royale unblocked full screen', indicating a lure to a gaming-related website. The presence of numerous external URIs points towards an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://vilenefex.ru/wix?keyword=zombs+royale+unblocked+full+screen PDF link annotation
    • https://resawipodejevi.weebly.com/uploads/1/3/0/8/130814711/ff4b6d39f.pdfIn PDF document text
    • https://xowimigijik.weebly.com/uploads/1/3/1/6/131637135/a172a7f77a96c.pdfIn PDF document text
    • http://nexofozupugasi.mywebcommunity.org/dbt_skills_worksheets_free.pdfIn PDF document text
    • https://xepezexitig.weebly.com/uploads/1/3/0/9/130969834/kibubiramura-panele-vufezunediponer-lupix.pdfIn PDF document text
    • http://bitalotava.scienceontheweb.net/zapekote.pdfIn PDF document text
    • https://cdn.sqhk.co/girolivudafo/fNSgcid/pigemasoja.pdfIn PDF document text
    • https://cdn.sqhk.co/kizofapekeku/VC3oT9R/diaphragmatic_breathing_exercises_for_anxiety.pdfIn PDF document text
    • http://kevogam.22web.org/71328484517.pdfIn PDF document text
    • https://cdn.sqhk.co/mukutosi/b6ghfgh/zombies_run_wikipedia.pdfIn PDF document text
    • http://xonitaj.mywebcommunity.org/how_to_cook_in_a_combi_microwave.pdfIn PDF document text
    • https://cdn.sqhk.co/dorejewibiz/iiieqrw/39342566121.pdfIn PDF document text
    • https://cdn.sqhk.co/difigobon/PiiVrii/99791819908.pdfIn PDF document text
    • http://xulodol.mygamesonline.org/independent_events_probability_examples.pdfIn PDF document text
    • https://damobupakul.weebly.com/uploads/1/3/1/4/131453350/a5092854147aed.pdfIn PDF document text
    • https://cdn.sqhk.co/vemetafije/ejj24gf/38642461494.pdfIn PDF document text
    • https://cdn.sqhk.co/savunowudob/iSibibX/word_switch_cross_and_connect_reviews.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/lulojugorodejuwewugop.pdfIn PDF document text
    • http://soxosodazafu.epizy.com/paxurukogivilamosuveludab.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/keloid_scar_formation_time.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/67858150509.pdfIn PDF document text
    • http://golujaxi.epizy.com/simpsons_season_16_episode_guide.pdfIn PDF document text
    • http://xilavivugup.epizy.com/blank_college_degree_template.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_off00010475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10475 5428 bytes
SHA-256: 30b2f388ef2c1c9f82b8383c1efde55d5b9dd510b7507b4d90f1e3e6c689981d
font_01_sfnt_off000116dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DC 13252 bytes
SHA-256: 370158b1dc384fcd4fddc693f16bcf5a01f3b7a33b98dc738c0be7eba2cea102

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