Malicious PDF — malware analysis report

Static analysis result for SHA-256 303cac5e363af35a…

MALICIOUS

PDF

74.9 KB Created: 2021-04-28 05:33:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a7e423b21e7bd5e87046769655599c3e SHA-1: ba7cd70d9294f67ec618dc1595e639fee3b4f1a8 SHA-256: 303cac5e363af35a58a9cc1c99eb1ee4324870cbc9655f2d1598677ac3690fe1
126 Risk Score

Malware Insights

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

The PDF document contains a misleading title about brightening a room with paint, which is a common lure for phishing or malware distribution. It embeds multiple external URIs, with a high-confidence malicious URL identified as 'https://baarspo.ru/strik?utm_term=how+to+brighten+a+room+with+paint'. ClamAV detection as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' further supports its malicious nature. No scripts were extracted, but the overall structure and embedded links point to a phishing or malware delivery attempt.

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://baarspo.ru/strik?utm_term=how+to+brighten+a+room+with+paint PDF link annotation
    • https://cdn.sqhk.co/wemopizajazo/giWHEhf/steel_weight_calculation_formula_in_kg.pdfIn PDF document text
    • http://nesobaka7.xyz/99359303712dzpp1.pdfIn PDF document text
    • http://cosmeteca.com/57643675091c3zgy.pdfIn PDF document text
    • http://ergors.space/immunology_made_ridiculously_simple_ebookegkh0.pdfIn PDF document text
    • http://femovanisom.iblogger.org/lawesinibogeb.pdfIn PDF document text
    • http://ebay-coupon.ru/resivilejowadavigonowatij1vsd4.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/wgjoYib/crazy_kick_app_store.pdfIn PDF document text
    • http://winoorama.site/pokukuruneluriei5x.pdfIn PDF document text
    • http://3bki.ru/baixar_google_chrome_canary_android8ug98.pdfIn PDF document text
    • http://betmoy54.com/expressing_cause_and_effect_exercises_with_answers869e0.pdfIn PDF document text
    • http://naturfresh.fun/92191524422mx9ip.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/fidefofudi/manual_adobe_audition_3._0_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/98084472778.pdfIn PDF document text
    • http://zipituvopedisi.rf.gd/group_isomorphism_theorems.pdfIn PDF document text
    • http://buwefewi.epizy.com/22237198165.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/cakewalk_sonar_8._5.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/63230103807.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/jumefixitawegarowifa.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/81412752310.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_off0000e866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE866 5216 bytes
SHA-256: a2c6a0ba5e6b4e37885da43a4eb965d11de21c6f02421e750e3af8ca69f1e558
font_01_sfnt_off0000fa0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0B 10748 bytes
SHA-256: 749f2e518c7aaf4830232bd4891633d7b2a31ab1da393c3ecab59e01fc51808f

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